Listen to It Must Be Jelly (Cause Jam Don't Shake Like That) online. It Must Be Jelly (Cause Jam Don't Shake Like That) is an Unknown language song and is sung by Glenn Miller Orchestra. It Must Be Jelly (Cause Jam Don't Shake Like That), from the album Chattanooga Choo Choo, was released in the year 2014. The duration of the song is 2:58. Download Unknown songs online from JioSaavn.