"Rock Me" is a mid-tempo pop rock song. Both "Billboard" and BBC Music said that the song was a departure from One Direction's signature bubblegum pop sound. One Direction's members’ voice ranges on the song span from F4 to C6. The instrumentals feature guitar strings and piano lines. The song is in the key of Ab major, the time signature is common time, and the tempo is a moderate 84 beats per minute. 