Trombone Day

trombone player

Dr. Oscar Diaz, Jr. is the Associate Professor of Trombone at Texas A&M University-Kingsville. He holds dual Bachelors Degrees in Trombone Performance and Music Education from Texas A&M University at Kingsville, a Masters Degree in Trombone Performance from The University of Northern Colorado and a Doctor of Musical Arts degree in Trombone Performance at the University of Texas at Austin. His principal teachers include Dr. Nathaniel Brickens, Dr. Nathaniel Wickham, Dr. Paul Hageman, Ed Avila, Wanda Avila, Ron Welborn, and Paul Larson Dr. Diaz has performed with the Fort Collins, Longmont, and Cheyenne Symphonies of Colorado, and Wyoming.

He was a freelance trombonist in the northern Colorado area performing with numerous jazz bands and brass quintets. He has recorded with The Dave Camwell Group, the University of Northern Colorado Lab Band I, JazzBonez and The University of Texas Trombone Choir (winners of the Emory Remington Competition in 2007). Dr. Diaz is an active soloist and clinician. He has been a featured guest artist at the International Trombone Festival, and the American Trombone Workshop. He has given many solo recitals, concerto performances, master classes and lectures around the United States.

Dr. Diaz has shared the stage with trombone greats such as Bill Reichenbach, Conrad Herwig, Slide Hampton, and The Trombones de Costa Rica to name a few. He has performed in numerous master classes with artists such as Henry Charles Smith, Ralph Sauer, the Canadian Brass, and The Trombones de Costa Rica. Dr. Diaz is currently Principal Trombonist in the Laredo Philharmonic Orchestra, Second Trombonist in the Victoria Symphony, Bass Trombonist in the Corpus Christi Symphony Orchestra and freelances in the South Texas area. He is a member of the Jazz Trombone Ensemble “Jazzbonez”, winners of the 2007 Kai Winding Jazz Trombone Competition and the 2007 National Jazz Trombone Ensemble/Capitol Bones Competition. Also as a founding member of the Minor Fourth Trombone Quartet, he tours every year around the state and nation. Most recently the M4TQ performed with the United States’s “Pershing’s Own” Army band at the American Trombone Festival in Washington D.C.

The Texas A&M University-Kingsville Trombone Choir under Dr. Diaz’s baton has been awarded an honorable mention award from the International Trombone Festival’s Emory Remington Trombone Choir competition. Due to the continued excellence of the studio, the choir was invited to perform at the International Trombone Festival in Valencia, Spain in 2015. Over the years, the studio has performed at the Eastern Trombone Workshop now American Trombone Workshop in 2010 and in 2014, the Texas State Symposium in 2013, various high schools, and numerous high profile university functions personally invited by the president of our university. Over the years, members of the TAMUK Trombone studio have been placed in national and international solo competitions as well as being accepted to many outstanding institutions throughout the nation post-graduation. Oscar Diaz is an artist/clinician for Michael Rath Instruments.

2nd Annual Trombone Day at Southeast Missouri State University
April 14, 2018

Click here to register for Trombone DayView the Flyer

Where: The event will be hosted on the River Campus in the Seminary and Dobbins Buildings.


8AM Registration 
9AM Warm Up Fundamentals Class, Dr. Joseph L. Jefferson 
10:00AM Mass Trombone Ensemble Reading, Dr. Oscar Diaz Jr. 
11:30AM Trombone History & Ensembles Presentation
12PM – 1:30PM Lunch (on your own)
1:30PM Master Class, Dr. Oscar Diaz Jr.
2:30PM Q & A - A Day in The Life as a Music Major 
3:00 Exhibits 
4PM Final Concert

Pianist Dr. Sehee Lee, a native of Korea, is a collaborative pianist and chamber musician. She is Lecturer of Piano and Collaborative piano at Texas A&M University -Kingsville. Dr. Lee has appeared as a collaborative pianist in a variety of venues across the United States, Germany, Luxembourg and Korea. She received her Bachelor’s and Master’s Degree in Piano Performance from the Kyunghee University in Seoul, Korea. She continued her studies with Anita Pontremoli at Cleveland Institute of Music, where she earned her Artist Diploma and Master’s Degree in Collaborative Piano. During her time at CIM, Dr. Lee has received honors including the Rosa Lobe Memorial Award in Accompanying, which is given to recognize the highest level of artistic achievement.

She earned her doctoral degree in Collaborative Piano at the Arizona State University, where she studied with Andrew Campbell as a full-scholarship recipient. Dr. Lee is a founding member of the LOS Trio with flutist, JinHee Oh and cellist, Hyon Jae Song. Her trio won the Alexander & Buono International Competition and has been invited to perform in the winner’s recital in New York City, New York. She currently performs as a member of the Vista trio, a flute, clarinet and piano ensemble. Dr. Lee has attended the Music Academy of the West (Santa Barbara, CA) and the Kent Blossom Music Festival (Kent, OH) as a fellowship student. As an active collaborator, she was invited to the Killington Music Festival in Vermont, Vianden Music Festival in Luxembourg and Bowdoin International Music Festival in Maine as a staff pianist. Dr. Lee gives over fifty recitals with singers and instrumentalists every year throughout the United States and Korea.

A Virginia native, Dr. Joseph L. Jefferson is currently the Assistant Professor of Applied Trombone and Director of Jazz Studies at Southeast Missouri State University. As a trombonist an educator, Joseph maintains an active performance schedule as a soloist in Classical, Jazz, and commercial musical settings both nationally and internationally. As a scholar, Joseph has researched the Shout Band Tradition in the United House of Prayer; this research was published by ProQuest/UMI. Similar to his excellence in scholarship, Joseph continues to exercise his musical palate by performing in Pop, Neo-Soul, and Latin music genres. As a specialist in the areas of trombone and low brass, Joseph has served as a guest artist, clinician, and adjudicator for both high schools and collegiate music programs throughout the United States.

Prior to moving to Missouri, Joseph performed regularly with the Portland Jazz Composers Ensemble as well as the Rose City Trombones. Additionally, he maintained an active freelance schedule throughout the Pacific Northwest. He has also served as second trombonist for the Tidewater Winds; a professional wind ensemble that performs in the “Sousa Band” tradition. In the classical genre, Joseph has performed with world-renowned artists and groups, such as: The Irish Tenors, U.S. Army Continental Band, American Guild of Organist Brass Ensemble, and with John Phillip Sousa IV, to name a few. As a jazz/commercial musician, he has performed with the Stuart Dempster, Louis Romanos Quartet, Jae Sinnett, Mike Berkowitz, Mark Michelson Big Band, Randy Brecker, Slide Hampton, The Fuzz Band, Sinatra at the Sands Big Band Review, and the Treasure Valley Swing Band. Commercially, he has performed with "Right On" – The Worlds Greatest Show Band, and 10 Spot Variety Band. Joseph has also performed with international R&B artists Dwele, Jon Bibbs and Raheem Devaughn. As a collaborative artist, he has worked with renowned Oregon poet, Lawson Inada, for an evening of jazz and poetry. As a soloist, Joseph has performed with the Fruitland Wind Ensemble as well as the Treasure Valley Wind Symphony. He has also premiered compositions by Stuart Dempster, Andrew Durkin, James Hosay and Robert Senay.

Joseph’s honors and awards range across the scholarship and musical spectrum. These honors and awards include: Best Jazz Ensemble and Best Trombone Section (Villanova Collegiate Jazz Festival), finalist in American Prize Competition (as a member in the West Virginia University Symphony Orchestra), University Provost Fellowship (West Virginia University), Academic Enrichment Fellow (West Virginia University), and a Chancellor Scholar (West Virginia Higher Education Policy Commission). Recently, the Jazz Society of Oregon featured Joseph in its Jazz Scene publication.

Joseph has held faculty positions at the University of Portland, Treasure Valley CC, Boise State University - Jazz Combo Camp (Trombone), Tidewater CC, and John Handley High School. Dr. Jefferson has earned degrees from West Virginia University (D.M.A.), Shenandoah Conservatory (M.M.) and Norfolk State University (B.M.) Joseph’s primary teachers include Dr. Keith Jackson, Dr. Wayne Wells, Dr. Mike Hall, and Mr. Paul Adams. He has also studied with Andre Hayward, Dr. Natalie Mannix, Ron Barron, Delfeayo Marsalis, David Vining, Amanda Stewart, and Donna Parkes.

Dr. Joseph L. Jefferson is an active member of Phi Mu Alpha Sinfonia, Kappa Kappa Psi National Honorary Band Fraternity Inc., Kappa Alpha Psi Fraternity Inc., Jazz Education Network, International Trombone Association, Texas Music Educators Association, and the College Music Society and is available as a soloist, clinician, or adjudicator. Joseph is a performing artist for S.E Shires Trombones and Giddings Mouthpieces.

The following highlights of the day will be:

Group Warmup
Exhibits and more.

Contact Dr. Joseph Jefferson at for more information.


River Campus Seminary 254
Department of Music
One University Plaza, MS 7800
Cape Girardeau, Missouri 63701