Clive Davis with rock singer Janis Joplin in 1969. Joplin was Davis' first discovery of a future star. In 1968 Davis recorded -- and, according to allmusic.com, personally reedited the single to -- her hit song "Piece of My Heart." "To this day, there's nobody, nobody that sounds like Janice Joplin," Davis told Cynthia McFadden. WATCH THE FULL INTERVIEW TONIGHT AT 12:35 A.M. ON "NIGHTLINE."