To learn Cass Phang - Jailbird chords, grasp the musical fabric of the song with this sequence - Ebm, Ab, Bbm, Db, Ab, Gb, Fm, Bbm, Fm, Gb and Db of chords. I suggest starting at a calm pace of 51 BPM, and as you gain confidence, approach the song's BPM of 104. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: Db Major.