To start learning Chiaki Ishikawa - Uninstall chords, build your understanding on these basic chords - Ab, Eb, Fm, Db, Cm, Db and Eb in sequence. Start with a comfortable 61 BPM and as you become proficient, aim for the song's BPM of 123. Considering the song's key of Ab Major, position your capo to suit your vocal and chord preferences.
