Continuing from where both previous albums left off, "Machine Head" was released in late March 1972 and became one of the band's most famous releases. It was the band's second No. 1 album in the UK while re-establishing them in North America, hitting No. 7 in the US and No. 1 in Canada. It included tracks that became live classics, such as "Highway Star", "Space Truckin'", "Lazy" and "Smoke on the Water", for which Deep Purple are most famous. They continued to tour and record at a rate that would be rare thirty years on; when "Machine Head" was recorded, the group had only been together three-and-a-half years, yet the album was their sixth.