Stings
If you play the violin, the alto (viola), the cello or the double bass, you can sign up.
Woodwind
If you play the flute, the oboe, the B♭ clarinet, or the bassoon, you can sign up
Brass
If you play the D horn, the B♭horn or the D trumpet, you can sign up.
Percussion
If you play the D or A timponi, you can sign up.
Choir
If you have a soprano voice, an alto voice, a tenor voice or a bass voice and you want to sing in a group you can sign up.
soloist
If you have a soprano voice, an alto voice, a tenor voice or a baritone voice and you want to sing alone you can sign up.