 "Round & Round" is a dance-driven electro-pop rock song with a length of three minutes and five seconds, composed by Kevin Rudolf, Andrew Bolooki, and Jeff Halatrax, Jacob Kasher and Fefe Dobson.The song's disco influence was noted to be new for Gomez's usual "poppy" music.Mikael Wood of "Billboard" said the song "rides a fist-pumping electro groove".