To take the late Elliott Smith's solo work at face value, he was known for dark, introspective songwriting that influenced a generation of indie musicians. But his early work in the band Heatmiser tells another side of the story - and this fall, 20 years after his tragic passing, Third Man Records will revisit the band's work with a collection of rare and unreleased material. The Music of Heatmiser, available on CD or 2LP October 6, is named for the self-released cassette the group -