Guitar,Piano - Level 3 - Digital Download SKU: A0.975678 By Katy Perry. By Henry Walter, Jordan Houston, Katy Perry, Lukasz Gottwald, Max Martin, and Sarah Hudson. Arranged by Trevor de Clercq. Pop. Score and part. 2 pages. Trevor de Clercq #6400857. Published by Trevor de Clercq (A0.975678). This Nashville Number Chart shows chord numbers for the harmonic content of the song and can be used by any instrument (e.g., piano, guitar, bass) to play along with the song or transpose the song into any key. No lyrics, melody, or detailed chord voicings are included.