Horace Silver, the prolific jazz pianist and composer who cofounded the legendary Jazz Messengers, pioneered the genre known as hard bop and mentored scores of musicians, has died. He was 85. Silver died Wednesday at his home in New Rochelle, N.Y., of natural causes, according to his son, Gregory. Through classic compositions such as “Song for My Father,” “Nica's Dream” and “Señor Blues,” Silver influenced generations of musicians with a style that encompassed all his musical loves: gospel, blues, Latin rhythm. It was music that, in Silver's words, “cooked” and “burned.”