To write intervals, memorize the following:

Music Fundamentals   William Wieland

Augmented (A) Major (M) minor (mi) diminished (d) ( 2, 3, 6, 7 )	Augmented (A) Perfect (P) diminished (d) ( 1, 4, 5, 8 )	P8 — same name M7 — almost an octave (mi2 smaller) — Sevenths Diagram mi7 — close to an octave (M2 smaller) — Sevenths Diagram M6 — M2 larger than a P5 — Sixths Diagram mi6 — mi2 larger than a P5 — Sixths Diagram P5 — root to 5th of any major triad or minor triad — FCGDAEB — Circle of 5ths A4 or d5 — a.k.a. tritone — without accidentals, only F/B or B/F P4 — BEADGCF — The Circle of 5ths is also the circle of 4ths. M3 — 4 half steps — root to 3rd of any major triad — 1 to 3 of any major scale or major key mi3 — 3 half steps — root to 3rd of any minor triad — 1 to 3 of ANY minor scale or minor key M2 — 2 half steps, i.e. 1 whole step mi2 — half step P1 — identical pitch

							do
						ti
					la
				sol
			fa
		mi
	re
	do	do	do	do	do	do	do
The major scale method:	M2	M3	P4	P5	M6	M7	P8