(prepend (+ x 7) (cons x l))))
(prepend first-position '())))))
+(define-public (key-signature-interface::alteration-position
+ step alter c0-position)
+;; Deprecated. Not a documented interface, and no longer used in LilyPond,
+;; but needed for a popular file, LilyJAZZ.ily for version 2.16
+ (if (pair? step)
+ (+ (cdr step) (* (car step) 7) c0-position)
+ (let* ((c-pos (modulo c0-position 7))
+ (hi (list-ref
+ (if (< alter 0)
+ '(2 3 4 2 1 2 1) ; position of highest flat
+ '(4 5 4 2 3 2 3)); position of highest sharp
+ c-pos)))
+ (- hi (modulo (- hi (+ c-pos step)) 7)))))
+
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