Mode 4 of Fb Major Scale

A Lydian

Space plays and stops
Notes
ACbDbEbFbGbAb
Steps
W W W H W W
Intervals
2 2 2 m2 2 2

The major scale and its modes are the most commonly used scales in western music.

A Lydian is the 4th mode of the Fb Major Scale: its notes, Fb Gb Ab A Cb Db Eb, played from A.

Chords it fits