According to the Christian Film Database (CFDb):
You will love David and Saul’s duet, and later David’s bold song as he comes to challenge Goliath. But not all songs are serious. When David proposes that he be sent to fight Goliath, we get a real toe-tappin’ dixieland jazz number “Give me just one chance to prove he’s just a man.”
The CFDb also says:
Thurl Bailey makes a fantastic Goliath. His main musical number, “I am Goliath” is both dramatic and beautiful. You almost hate to see him go down when David fights him. But be prepared for an unexpected twist toward the end of the movie.
Wikipedia explains, for the uninitiated: “Thurl Lee Bailey (born April 7, 1961 in Washington, D.C.) is an American retired professional basketball player whose NBA career spanned from 1983 to 1999 with the Utah Jazz and the Minnesota Timberwolves.”
The David and Goliath musical is from the Liken Bible Series, which provides other “Musical Adventures in Faith” featuring Daniel, Esther, Jonah, and baby Jesus.