Broadway's most recycled song
This is an odd bit of trivia I've been trying to research: what song has been recycled into the greatest number of Broadway shows? For example, George and Ira Gershwin wrote "Someone to Watch Over Me" for Oh, Kay! It was later recycled in both Crazy For You and Nice Work If You Can Get It, and it may have been used in other revues between 1926 and 1992. What other songs like this are out there, and which has been used more times than any other?