Ingrid Michaelson (born 1979) is a New York-based indie-pop singer-songwriter, probably best known for her single "The Way I Am." Her music has been featured in episodes of several popular television shows, including Grey's Anatomy … see full wiki
You may have heard Ingrid's music featured on Grey's Anatomy several times or in the Old Navy commercials for sweaters. If not, she is in the same vein as Sara Bareilles and A Fine Frenzy. Ingrid's music isn't life changing but it is great pop music complete with catchy choruses and complex vocal arrangements.
I vehemently recommend Ingrid's live performances because they are what live shows are supposed to be - a participatory experience with an exchange between the artist and listener. In her case, she managed to get an LA crowd singing along to her songs with little effort.
Listen to: "Winter Song", a duet with Sara Bareilles, "Masochist" and "Keep Breathing"