"Available" features production by Justin's songwriting partner Poo Bear and music director HARV. However, there is a third, more unexpected name on the credits: NBA center JaVale McGee.
HARV explained to Billboard
that McGee plays the piano and produces. Poo Bear had a small snippet of something that McGee had done and he told HARV: "I want you and JaVale to take this little piece that JaVale did, and then take it to the next level." So HARV took one of Bieber's a cappellas from Poo Bear titled "Available" and added some bells and whistles, "with JaVale McGee sprinkled on it."