The Doobie Brothers reunited with former singer/keyboardist Michael McDonald Thursday night for a performance of “What a Fool Believes” on The Tonight Show Starring Jimmy Fallon. Check out the video below.

McDonald and the Doobie Brothers worked together on their latest album Southbound, which was released in 2014. The album features the group pairing up with country artists on new versions of their classic songs.

The Doobie Brothers are currently on a co-headlining tour with Gregg Allman through November 15th.