One of the most memorable moments of this year's Lollapalooza - Earth, Wind & Fire joining Sabrina Carpenter as a surprise guest - came together in less than 24 hours, according to member Philip Bailey.

The R&B and disco band teamed up with Carpenter for a two-song set of "Let's Groove" and "September" on Sunday, Aug. 3

Which makes it all the more surprising to hear that Earth Wind & Fire’s surprise guest appearance during Sabrina Carpenter’s Lollapalooza set in Chicago on Sunday (3 August) was worked out at the last minute. In fact, the '70s soul/ disco legends had just 24 hours to prepare.