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Sara Bareilles is an American singer-songwriter and pianist. She achieved mainstream success in 2007 with the hit single "Love Song", which brought her into the number one spot on the Billboard Pop 100 chart.
Bareilles has been tapped on numerous occasions to perform with Weezer on certain performances of "(If You're Wondering If I Want You To) I Want You To", including the 2009 AOL Sessions version, an acoustic radio performance (which appears on the Raditude ...Happy Record Store Day! EP), on the show Jimmy Kimmel Live, and at an October 24th, 2009 Weezer show in Los Angeles, CA (which has been released as an official bootleg).