as you know. Banda music is most popular band in California.

also valves trombone is most important horn for Banda. 

to play with other instruments such as guitar bass or other C key instruments 

you need to transport finger chart. with this special trombone. you can learn fast and catch with other instruments much easier. if you don't understand what is that main. you ask your teacher.

if you need better deal on this horn you can ask julius by berkeleywind.