Learn the basic chords of Kesha - Praying chords, with this master sequence: Gm, F, Bb, Gm, Eb, Gm, Bb and Bb. A strategic approach would be to train at 36 BPM initially, and then accelerate to the song's tempo of 73. Considering your vocal pitch and chord choices, adjust the capo in accordance with the key: Bb Major.
