Blackmore set his own sights on 19-year-old singer Terry Reid. Though he found the offer "flattering", Reid was still bound by an exclusive recording contract with his producer Mickie Most and more interested in his solo career. Blackmore had no other choice but to look elsewhere. The band sought out singer Ian Gillan from Episode Six, a band that had released several singles in the UK without achieving any great commercial success. Six's drummer Mick Underwood – an old comrade of Blackmore's from his days in the Outlaws – introduced the band to Gillan and bassist Roger Glover. According to Nick Simper, "Gillan would join only with Roger Glover." This effectively killed Episode Six, which gave Underwood a persistent feeling of guilt that lasted nearly a decade, until Gillan recruited him for his new post-Purple band in the late 1970s. According to Blackmore, Deep Purple was only interested in Gillan and not Glover, but Glover was retained on the advice of Ian Paice. This created Deep Purple Mark II, whose first release was a Roger Greenaway-Roger Cook tune titled "Hallelujah". At the time of its recording, Nick Simper still thought he was in the band and had called John Coletta to inquire about the recording dates for the song. He then found that the song had already been recorded with Glover on bass. The remaining original members of Deep Purple then instructed management to inform Simper that he had been officially replaced. Despite television appearances to promote the "Hallelujah" single in the UK, the song flopped. Blackmore had told the British weekly music newspaper Record Mirror that the band "need to have a commercial record in Britain", and described the song as "an in-between sort of thing"—a compromise between the type of material the band would normally record, and openly commercial material. In September 1969, the band gained some much-needed publicity in the UK with the Concerto for Group and Orchestra, a three-movement epic composed by Lord as a solo project and performed by the band at the Royal Albert Hall in London with the Royal Philharmonic Orchestra, conducted by Malcolm Arnold. Alongside Days of Future Passed by the Moody Blues and Five Bridges by the Nice, it was one of the first collaborations between a rock band and an orchestra. This live album became their first release with any kind of chart success in the UK. Gillan and Blackmore