Pot o' Gold (1941)
Jimmy, the owner of a failed music shop, goes to work with his uncle, the owner of a food factory. Before he gets there, he befriends an Irish family who happens to be his uncle's worst enemy because of their love for music and in-house band who constantly practices. Soon, Jimmy finds himself trying to help the band by getting them gigs and trying to reconcile the family with his uncle, an avid music-hater, all while winning the heart of the beautiful Molly!
I am a great fan of Jimmy Stewart, but I don't recall having ever seen this film nor any other film with Stewart that could be classified as a musical/comedy. It is a must see for any film student and ANYONE who wants to laugh while they cry. On a four star rating system I give it FIVE!