Four flats. Very common in worship sets because of where it sits for voices. Guitarists usually capo 1 and play G shapes.
| Chord | Number | Roman |
|---|---|---|
| A♭ | 1 | I |
| B♭m | 2m | ii |
| Cm | 3m | iii |
| D♭ | 4 | IV |
| E♭ | 5 | V |
| Fm | 6m | vi |
| Gdim | 7° | vii° |
The 1, 4 and 5 (A♭, D♭, E♭) are the backbone. Add the 6m (Fm) and you can play most of what's on the radio. The 7° (Gdim) mostly shows up as a passing chord, so don't lose sleep over it.
Those numbers are the Nashville number system. Learn the progression as numbers once and it works in every key.
Capo 1, play G shapes; capo 4, play E shapes; capo 6, play D shapes.
The capo chart has every key, and the transpose chart moves a song somewhere else entirely.
Songs that leave A♭ usually go to its 4 or 5: key of D♭ or key of E♭. Or see every key.
Chartless listens to whatever is playing and shows the key, the chords and the numbers live, so you can check a recording against this page while it plays. How to find the key by ear if you'd rather do it yourself.