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Who is Paul McCartney? The toast of the music industry

Lady Gaga gives a smooch to Sir Paul McCartney atthe 54th Annual Grammy Awards on Feb. 12, 2012, in Los Angeles. Larry Busacca/Getty Images

(CBS/AP) Paul McCartney was the toast of the music industry this weekend. After being celebrated Friday night at MusicCares person the year, he performed a song from his just-released album during Sunday's Grammy telecast and led a rousing closing act with Dave Grohl, Bruce Springsteen and Joe Walsh.

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In fact, McCartney was so ubiquitous - he even smooched with Lady Gaga - this weekend that on Monday a "Who is Paul McCartney" . (Surely, it's a joke?)

Coldplay, Katy Perry, Tony Bennett and Neil Young plumbed Paul McCartney's vast songbook Friday night in taking the former Beatle on a musical journey of his more than 50-year career. They joined James Taylor, Diana Krall and Foo Fighters among others in launching Grammy weekend by honoring McCartney at the MusiCares tribute at Los Angeles Convention Center.

Among the star-studded crowd of 2,800 were Yoko Ono, "American Idol" judge Randy Jackson, David Crosby, Rosanna Arquette, Bonnie Raitt, Berry Gordy, Tom Hanks and wife Rita Wilson, music executive LA Reid, songwriter Diane Warren, Piers Morgan, and actor John Stamos.

Coldplay lead singer Chris Martin said, "We love Paul and we're happy to be here" before launching into "We Can Work It Out."

On Friday night McCartney treated the crowd to the same performance he would give Grammy audiences Sunday. He performed "My Valentine," a song he wrote for new wife Nancy Shevell, from his just released album"Kisses On the Bottom."

Paul McCartney closed the 54th Grammys ceremony last night with an "Abbey Road" medley of "Golden Slumbers," "Carry That Weight" and "The End."

He started at the piano and then moved to guitar and was joined in the bring-the-house-down collaboration by Dave Grohl of the Foo Fighters, Bruce Springsteen and Joe Walsh of the Eagles.

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