Haunting acoustic tune, female singer, early 2000s?
I think I saw this on a late night talk show, maybe Conan. Early to mid 2000s. Slow, haunting, acoustic tune, kind of folky. Petite girl, maybe dark hair and bangs? Only lyrics I remember are something like "in September" and a line that ended with "I'm in love with you..." I think it might have been the second song she sang that on the show; I kind of remember her playing this as the credits were rolling.