Let's start jamming Mob Choir - 99.9 chords, familiarize yourself with these chords - Ab, B, Bb, Ebm, Db, Ebm, B and Db in sequence. I suggest starting at a calm pace of 41 BPM, and as you gain confidence, approach the song's BPM of 84. Configure the capo to your vocal range and chord preference, remembering the key of Ab Major.