Maroon 5's Adam Levine on Actor Jason Segel's Musical Endeavors

Forgetting Sarah Marshall star Jason Segel made a surprise appearance at the Swell Season's November 18th concert at the Wiltern in Los Angeles, entertaining the ladies in the audience with a love song featuring his phone number as the chorus. In case anyone in the crowd couldn't make out the digits, as evidenced by the video above, Swell Season's Marketa Irglova held up a sign with Segel's number around the stage like she was a boxing match's ring girl. This is the second time in a week Rolling Stone is reporting on Segel's musical endeavors: The How I Met Your Mother actor will also serve as special guest when Maroon 5 play Las Vegas on New Year's Eve.

Get a look at more actor-rock stars, from Johnny Depp to Juliette Lewis.

Segel recently joined Maroon 5 onstage when the band performed at St. John's University in Queens, New York, in early November. "Jason was a little apprehensive about playing with us because we were playing a super religious school," Maroon 5's Adam Levine tells RS. "There was a hall monitor that told him not to curse earlier. But I knew the crowd would love him."

In addition to his comedic roles, Segel has acquired a reputation as being a musician in Hollywood after contributing both the infamous "Dracula Song" and Russell Brand's rock songs to Sarah Marshall. In Segel, Levine found the perfect person to revive an old musical tradition. "I feel like musicians and comedians used to collaborate more, in the '70s and '80s. That whole SNL crew. Live concerts had a lot of comedians and musicians. It's a lost thing," Levine told RS. "I remember Paul Simon would be on SNL all the time, doing skits, performing. Like on [Eddie Murphy's] Delirious, there was a live band performing before. I'd love to bring that back. Would be so cool to see a comedian you love and a huge band you love."

As for why Segel turned his personal phone number into a song's chorus for the hundreds of female Swell Season fans at the Wiltern — and now the 23,000 and counting YouTube viewers — Levine said, "You'll have to ask him. I can't reveal the secrets of the mystique that is."

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