Scales

Interval

Quick

abbreviation

Example

in C

Number of

Half Steps

augmented 4th

Quality

Number

when you count the NUMBER,

you always count inclusive

Inversions

when inverted, P5 intervals become P4s

and vice versa

maj becomes min,

2nds becomes 7ths,

3rds become 6ths -

vice versa for all.

Perfect Unison becomes Perfect octave

Dim 5ths stays the exact same.

659.2 hz ≈ 660 hz

440 hz