"What's Up with That" is a song by ZZ Top, released as the second single from their 1996 album Rhythmeen.

[3] The song is a deliberate return to ZZ Top's blues roots, dropping the synthesizers and back to the guitar.

[1] The single features two previously unreleased live recordings that were captured "live and sly during one of the many ZZ Top late nights".

The first live song is a cover version of "Stop Breaking Down Blues" by the blues musician Robert Johnson; that song was only played live during the 1996 Continental Safari Tour.

The second live song is "Nasty Dogs and Funky Kings", originally from their 1975 album Fandango!.