Trombone Shorty was joined on stage over the weekend with Nirvana drummer Dave Grohl for a cover of the band's song "In Bloom".
Grohl has only performed the song twice since Nirvana split following Kurt Cobain's passing in 1994.
You may remember the first time was with Nirvana's surviving members at their Rock and Roll Hall of Fame induction.
This performance took place at Voodoo Threauxdown festival in Los Angeles on Saturday, have you seen the videos or heard the performance? And?