Listen to I Guess I'll Have To Change My Plan (from the musical "The Band Wagon") (Rec. 11 August 1932) online. I Guess I'll Have To Change My Plan (from the musical "The Band Wagon") (Rec. 11 August 1932) is an English language song and is sung by Rudy Vallee. I Guess I'll Have To Change My Plan (from the musical "The Band Wagon") (Rec. 11 August 1932), from the album Early Musical And Movie Stars (Digitally Remastered), was released in the year 2011. The duration of the song is 3:13. Download English songs online from JioSaavn.