Class MelodyAnalysis

Finds recurring interval patterns (motifs) in a melody, up to 9 notes long. Occurrences are counted without overlap (in C D C D C, C-D-C occurs once). A pattern that only recurs inside a longer motif, as often as it, is left out. Sorted by number of occurrences, then by length (longest first).

Returns the contour of a melody as a sequence of direction symbols. '+' = ascending, '-' = descending, '=' = repeated pitch.

Returns the contour reduction of a melody: only local peaks and troughs. The first and last notes are always included.

Returns a histogram of interval classes between consecutive notes. Keys are interval sizes in steps (signed); values are occurrence counts.

Reduces a melody using durational weight - keeps structurally important notes. Uses a simple approach: notes with longer durations are more likely to be kept.