To learn At17 - When I Was 17 chords, your first step should be understanding these chords - Bb, Dm, Eb, F, Bb, Eb, Cm, F, Dm and Gm in sequence. Adjust your pace with the tempo control on ChordU, starting slowly and speeding up progressively. Considering your vocal pitch and chord choices, adjust the capo in accordance with the key: Bb Major.