 Complete the following phrase:  In March 1970, Davis began to perform as the opening act for rock acts, allowing Columbia to market Bitches Brew to a larger audience. He shared a Fillmore East bill with the Steve Miller Band and Neil Young with Crazy Horse on March 6 and 7. Biographer Paul Tingen wrote, Miles newcomer status in this environment led to mixed audience reactions, often having to play for dramatically reduced fees, and enduring the sell-out accusations from the jazz world, as well as being attacked by sections of the black press for supposedly genuflecting to white culture. The 1970 tours included the 