data Note attr

type T attr

noteAttrs

notePitch

toMelodyNullAttr

note

note'

c

cs

df

d

ds

ef

e

es

ff

f

fs

gf

g

gs

af

a

as

bf

b

bs

cf

cMaj

cMajChd

cMajArp

noteToPitch

invertNote

invert

retroInvert

invertRetro

retro