YSL 872 Trombone Alto, barillet de trille, série Xéno : Trombone Yamaha - SonoVente.com
Antoine Courtois alto trombone with trill valve for sale. I played this instrument few times, still like new. If you are interested and want more... | By George Krimperis | Facebook
How to do lip trills on the trombone (With free Lip Trill exercise!) - YouTube
Everything You Need to Know About Trombones - Trill Trombone