Adam Levine Sings R. Kelly's 'Ignition (Remix)' at Annual 'Voice' Concert

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Adam Levine of Maroon 5

With only an electric guitar, Adam Levine covered one of his "favorite songs," R. Kelly's "Ignition (Remix)," Monday night at Hyde in West Hollywood, closing out the annual The Voice coaches concert. Levine treated the crowd of mostly media to a solo version of an early Maroon 5 song as well, "Sunday Morning."

Backed by The Voice house band, Gwen Stefani opened the night with "The Sweet Escape," followed by a duet with Pharrell Williams on their new song "Spark the Fire." Williams would return later to sing "Just a Cloud Away" from Despicable Me 2 and his Grammy-winning collaboration with Daft Punk, "Get Lucky."

In between performances from Stefani and Williams, Blake Shelton and season 2 contestant Gwen Sebastian, now a member of his band, performed solo versions of "Nobody But Me" and "Just South of Heaven."

Like Levine, Shelton had not performed the songs live with just his own guitar accompaniment before. "What better place to experiment than in front of a bunch of media people and critics," he deadpanned.