The San Francisco Bay Area rock scene of the late '60s was one that encouraged radical experimentation and discouraged the type of mindless conformity that's often plagued corporate rock. When one considers just how different Santana, Jefferson Airplane, Moby Grape, and the Grateful Dead sounded, it becomes obvious just how much it was encouraged. In the mid-'90s, an album as eclectic as Abraxas would be considered a marketing exec's worst nightmare. But at the dawn of the 1970s, this unorthodox mix of rock, jazz, salsa, and blues proved quite successful.