Pete Yorn's second album, Day I Forgot, kicks off with a tantalizing intro that finds the singer-songwriter crooning over a simple acoustic guitar. ''I could have been somebody else,'' he sings, ''but now I'm me this time.'' Unfortunately, who he is turns out to be not very interesting. There's nothing wrong with these 12 midtempo rock songs, but they mostly lack personality and distinctiveness. It's a bad sign when a CD's most memorable melody is borrowed from Cat Stevens' ''Father and Son.''