I often get Brigadoon (Lerner and Lowe) confused with Finian's Rainbow (Harburg & Lane). I enjoy both.

Here are the Wikipedia descriptions:

Brigadoon (1947) features two American tourists who stumble upon Brigadoon, a mysterious Scottish village that appears for only one day every 100 years. Tommy, one of the tourists, falls in love with Fiona, a young woman from Brigadoon. Hit songs from this musical were "I'll Go Home With Bonnie Jean," "The Heather on the Hill," and "Almost Like Being in Love."

In Finian's Rainbow (1947), an elderly Irishman, Finian McLonergan, moves to the southern United States with his daughter Sharon, to bury a stolen pot of gold near Fort Knox, in the mistaken belief that it will grow. Og, a leprechaun, follows them, desperate to recover his treasure before the loss of it turns him permanently human. Complications arise when a bigoted and corrupt U.S. senator gets involved, and when wishes are made inadvertently over the hidden crock. The Irish-tinged music score includes gospel and R&B influences. The hit song from this musical was "How Are Things in Glocca Morra."