"Is That So?" is an instrumental jazz tune in the key of C, with no lyrics. It is credited to Duke Pearson and Benny Harris as composers. The tune was first recorded by The Duke Pearson Nonet and released on the album Honeybuns in 1966. As an instrumental, it is carried entirely by its melody and changes.
Lee Morgan recorded the tune in 1966 and again in 1984. Other later versions include recordings by Ernie Wilkins, Michael Dease, Jorge Rossy and Jocelyn Gould.
