With the seventies drawing to a close and with three successful albums released under the Rainbow moniker, the ever-restless Ritchie Blackmore looked to make changes. In a quest to push Rainbow towards a more commercial and radio-friendly direction a big shake up occurred, resulting in the departure of three of the band’s five members. While Cozy Powell retained his position on drums, a quest for a new bassist saw the appointment of Blackmore’s old Deep Purple mate Roger Glover, while the role of keyboard player was filled by future Ten/Deep Purple member Don Airey. Certainly the most devastating loss was that of Ronnie James Dio, who supposedly had no interest in Blackmore’s new vision for the band. Since a talent like Dio’s comes along once in a lifetime, perhaps other musicians would have fought to reach a compromise; but in any band featuring Ritchie Blackmore, Blackmore’s decision is final.