Music.Theory.Interval
data Interval_T
data Interval_Q
data Interval
interval_ty
interval_q_tbl
interval_q
interval_q_reverse
interval_semitones
note_span
invert_ordering
interval
invert_interval
quality_difference_m
quality_difference
pitch_transpose
circle_of_fifths
parse_interval_type
parse_interval_quality
interval_type_degree
interval_quality_pp
parse_interval
interval_pp
std_interval_names