No you dont, but it helps alot if your playing with, lets say, a horn player. sence you dont play horns, you cant really tell him how to get the sound you want, but if you know music thero, you can say "key of cm, 3/4 timeing, and heres the music sheet with notes I want you to play"... or something like that. Also if you play in a jazz band or do classical, you useally a use sheet music to help you to play along with other people.
Im not really sure where Im going with this, but really, its like reading and talkeing. you can still be a good speker if you dont know how to read, but if you learn how to read it helps...
Wow, I hope that makes sence and your can read my long reabmling paragraph...
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