Things have changed a lot since I left, Many establishments had a Blue Jacket Brass band and they were usually very good and also usually meant you got special duties (whoopeee).
Also many ships seem to acquire a ships group, just a few lads who wanted to play music. On the old Ark Royal we had some excellent groups many who played gigs wherever the ship docked.
So hopefully things haven't changed too much and you can continue enjoying your music.