were less than happy at the band being tagged as "a group who played with orchestras", both feeling that the Concerto was a distraction that would get in the way of developing their desired hard-rocking style. Lord acknowledged that while the band members were not keen on the project going in, at the end of the performance "you could have put the five smiles together and spanned the Thames." Lord would also write the Gemini Suite, another orchestra/group collaboration in the same vein, for the band in late 1970, although the band's recording of the piece wouldn't be released until 1993. In 1975, Blackmore stated that he thought the Concerto for Group and Orchestra wasn't bad but the Gemini Suite was horrible and very disjointed. Roger Glover later claimed Jon Lord had appeared to be the leader of the band in the early years. Shortly after the orchestral release, Mark II began a hectic touring and recording schedule that was to see little respite for the next four years. The second album, and first studio album, of the Mark II era, released in 1970, was In Rock (a name supported by the album's Mount Rushmore-inspired cover), which contained the then-concert staples "Speed King", "Into The Fire" and "Child in Time". The non-album single "Black Night", released around the same time, finally put Deep Purple into the UK Top Ten. The interplay between Blackmore's guitar and Lord's distorted organ, coupled with Gillan's powerful, wide-ranging vocals and the rhythm section of Glover and Paice, now started to take on a unique identity that separated the band from its earlier albums. Along with Zeppelin's Led Zeppelin II and Sabbath's Paranoid, In Rock codified the budding heavy metal genre. On the album's development, Blackmore stated: "I got fed up with playing with classical orchestras, and thought, 'well, this is my turn.' Jon was into more classical. I said, 'well you've done that, I'll do rock, and whatever turns out best we'll carry on with.'" In Rock performed well, especially in the UK where it reached No. 4, while the "Black Night" single reached No. 2 on the UK Singles Chart, and the band performed the song live on the BBC's Top of the Pops. In addition to increasing sales in the UK, the band were making a name for themselves as a live act, particularly with regard to the sheer volume of their shows