The comedy icon and the hard-rocking sisters jam out to Madonna and Prince — and HAIM hits, of course — on a drive around Los Angeles.
When Gronk decides to try a career in music, Keegan trains with gruelling vocal warmups and a medley of timeless sports anthems.
The superstar siblings relive childhood battles and compare horror movie screams in between sing-alongs to Violent Femmes and Steppenwolf.
Mark, Robert, Daymond and Kevin take their minds off business by singing Taylor Swift, but before you know it, they're competing again.