音程

摘自wikipedia

摘自《弹指之间》

半音数	Minor/major/perfect	简称	例子	Augmented/diminished	简称	例子
0	Perfect unision	P1	C-C	Diminished second	d2	C-Dbb
1	Minor second	m2	C-Db	Augmented unision	A1	C-C#
2	Major second	M2	C-D	Diminished third	d3	C-Ebb
3	Minor third	m3	C-Eb	Augmented second	A2	C-D#
4	Major third	M3	C-E	Diminished fourth	d4	C-Fb
5	Perfect fourth	P4	C-F	Augmented third	A3	C-E#
6				Diminished fifth	d5	C-Gb
6				Augmented fourth	A4	C-F#
7	Perfect fifth	P5	C-G	Diminished sixth	d6	C-Ab
8	Minor sixth	m6	C-Ab	Augmented fifth	A5	C-G#
9	Major sixth	M6	C-A	Diminished seventh	d7	C-Bb
10	Minor seven	m7	C-Bb	Augmented sixth	A6	C-A#
11	Major seven	M7	C-B	Diminished octave	d8	C-Cb
12	Perfect octave	P8	C-C	Augmented seventh	A7	C-B#

半音数	大调	小调
0	C	A
1
2	D	B
3		C
4	E
5	F	D
6
7	G	E
8		F
9	A
10		G
11	B
12	C	A

差多少半音	C	D	E	F	G	A	B	C
C	0	2	4	5	7	9	11	12
D		0	2	3	5	7	9	10
E			0	1	3	5	7	8
F				0	2	4	6	7
G					0	2	4	5
A						0	2	3
B							0	1