Cab Calloway and his "hi-dee hi-dee ho" jazzy music begins this cartoon.
Through an animated owl figure, the famous jazz crooner sings "The Old Man And The Moutain" during the first half of 'toon as we see everyone in the forest fleeing when word gets out that he's coming. "He" is the old man. The lyrics of the song are good and so are the animated antics of the critters as they gather their stuff and run. The owl, through the song, is explaining to Betty why everyone is panicking.
Betty says she's going up to the mountain "to see this old man for myself." Betty dances her way up the mountain as we continue to hear the jazz music. En route she sees some strange sights.
When she meets him, they do a duet - some fabulous music! The old man even tap dances. Then we have the usual chase scene, this time with the old man after Betty, even squeezing the dress off her!
Mostly this is a showcase for Calloway's singing and his orchestra and it is so up-tempo that it's a real hoot to listen to. This is one of the few cartoons where the music is better than the visuals. And, the latter is good, too. Overall: one of the best Boop cartoons ever made.