Collins was originally hired by Disney as a songwriter, but given his history as a drummer for the rock band Genesis, he appealed to the Disney production crew, who "wanted a strong jungle beat to accompany Tarzan's adventures" [REF].
The song, originally called "Lullaby" is used in a scene when Tarzan's adoptive gorilla mother Kala sings that her baby should stop crying because she will protect her baby, and keep him safe and warm.