What does a #### or bbbb in front of a staff/bass clef mean on sheet music??
if it says #### (and it HAS to be on the F, C, G, and D lines) it means play every F, C, G, and D note as F#, C#, G# and D# instead, which for the folks at home means we will be playing in the key of E. If it says ♭♭♭♭ (and it HAS to be on the B, E, A, and D lines) it means play every B, E, A, and D note as B♭, E♭, A♭, and D♭ instead, which for the folks at home means we will be playing in the key of A♭. But when you see the symbols at the beginning, if there are 4 of them like you said, they HAVE to be on those exact lines. otherwise you can send the charts back with some