Houston, Texas-born keyboardist Joe Sample (1939-2014) would have earned his place in the music history books alone for his work as a sideman with such artists as Steely Dan, Joni Mitchell, Marvin Gaye, and Minnie Riperton.  But he also spent roughly thirty years as a founding member of soul-funk-jazz outfit The Jazz Crusaders (later, just The Crusaders) and enjoyed a solo career spanning two dozen albums in over 45 years.  Now, Cherry Red’s Robinsongs imprint has brought together three of those solo records – 1978’s Rainbow Seeker, 1979’s Carmel, and 1981’s Voices…