I first saw Blake Sennett in the television show Boy Meets World, but I became a fan of his through the band Rilo Kiley. Although most of the songs of Rilo Kiley are credited to both Jenny Lewis and Blake, I presume that Jenny composed most of the lyrics while Blake composed most of the music. For a lot of the songs, I really love his guitar work. I haven't listened to much from his other bands.
Since I've seen Rilo Kiley in concert several times, I have met Blake a couple times to have him sign my albums. He's always seemed a bit quiet and stand-offish to me.