It was a busy weekend for Rage Against the Machine guitarist Tom Morello, who joined Bruce Springsteen and friends at the MusiCares Person of the Year ceremony on Friday (Feb. 8) and then took part in the final performance of the 2013 Grammy Awards Sunday night (Feb. 10).

Morello was part of an all-star collaboration fronted by Grammy host LL Cool J and Public Enemy's Chuck D. on a song called 'Whaddup' off LL Cool J's new album, with a mix of Public Enemy's 'Welcome to the Terrordome.' Rounding out the five-piece was some nifty scratching from DJ Z-Trip and some dexterous beats from Blink-182's Travis Barker. Though Morello was mostly in the background on the track, he did come to the forefront for some serious shredding midway into the song.

The performance offered bits of throwbacks throughout from Chuck D.'s repetitious "Hear the drummer get wicked" to Z-Trip spinning a sample of LL Cool J's 'Rock the Bells.' In addition, LL Cool J through in a nod to the late Adam Yauch, shouting "MCA forever" before running off a few lines of the Beastie Boys' 'No Sleep 'Til Brooklyn.'

However, in a lame move, the end of the song was cut off by sponsorship mentions and a quick cutaway, presumably to keep the length of the show on time.

The performance concluded a night which also featured stellar performances from the Black Keys, Jack White, fun., and tributes to late musicians Bob Marley and Levon Helm.