(let* ((name (ly:pitch-notename pitch))
(alt (ly:pitch-alteration pitch))
(n-a (if (member (cons name alt) `((6 . ,FLAT) (6 . ,DOUBLE-FLAT)))
- (cons 7 (+ (if B-instead-of-Bb 1 0) alt))
+ (cons 7 (+ (if B-instead-of-Bb SEMI-TONE 0) alt))
(cons name alt))))
(make-line-markup
(list