Five sharps. Common in worship because it sits well for a lot of voices, and on guitar most people capo and play A or G shapes rather than fight it.
| Chord | Number | Roman |
|---|---|---|
| B | 1 | I |
| C♯m | 2m | ii |
| D♯m | 3m | iii |
| E | 4 | IV |
| F♯ | 5 | V |
| G♯m | 6m | vi |
| A♯dim | 7° | vii° |
The 1, 4 and 5 (B, E, F♯) are the backbone. Add the 6m (G♯m) and you can play most of what's on the radio. The 7° (A♯dim) 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 2, play A shapes; capo 4, play G shapes; capo 7, play E shapes.
The capo chart has every key, and the transpose chart moves a song somewhere else entirely.
Songs that leave B usually go to its 4 or 5: key of E or key of F♯. 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.