Larry Norman is the father of Christian Rock music, and this work, the third volume in his famous trilogy, is one of the foundational albums of the genre. What makes it of interest to fans is the song "U.F.O.", which compares the return of Christ to a U.F.O. sighting, and contains the lines:

And if there's life on other planets
then I'm sure that He must know
and He's been there once already
and has died to save their souls."