Key of "F" In reading over the piece there are several occasions that they add a (b)flat to the already normally flatted 'B" Example measure #10 treble clef. Other measures that include the 'double flat' are 8,10,12,13,17,18,19,20,29 (note: the first flat is part of the key signature) and 31.

Are these actually all double flats (bb) or mistakes in the transcription?

Thanks!

Bill