Listen to I Guess I'll Have To Change My Plan (from "The Band Wagon") online. I Guess I'll Have To Change My Plan (from "The Band Wagon") is an Instrumental language song and is sung by Guy Dearden. I Guess I'll Have To Change My Plan (from "The Band Wagon"), from the album Showstoppers 5 - Musical Theatre Backing Tracks, was released in the year 2021. The duration of the song is 2:01. Download Instrumental songs online from JioSaavn.