Sometime in 1971, new manager Miles Copeland III decided to re-organise the band, focussing on what he felt were Renaissance's strong points - Haslam's voice and Tout's piano. Will Romano in Mountains come out of the sky explained that "unlike many of the artists to which they were compared Renaissance allowed the piano and female voice to come to the forefront". Until then Haslam had shared vocals with Terry Crowe, who was in effect the band's chief vocalist. Crowe and Korner went, the former unreplaced, the latter replaced by a succession of bass players, including John Wetton (later of King Crimson, UK, and Asia), Frank Farrell (later in Supertramp) and Danny McCulloch (formerly of The Animals and a former bandmate of Dunford and Crowe in The Plebs), until the position settled with the inclusion of Jon Camp. It was also decided that Dunford would now concentrate on composing, and a new guitar player, Mick Parsons, was brought in for live work. In 1972, shortly before recording sessions for the new band's debut LP, drummer Terence Sullivan joined after Slade's initial replacement, Ginger Dixon, was deemed unsuitable following a European tour. Parsons died in a car accident and was replaced at short notice by Rob Hendry. The resulting line-up entered the studio having played only a dozen gigs together.  Prologue was released later in 1972 on EMI-Sovereign Records in the UK and on Capitol-Sovereign in North America. Prologue's music was, except for two songs by McCarty, composed by Dunford, with all lyrics by Thatcher-Newsinger. Rock radio stations (particularly in the northeast US and Cleveland) gave the song Spare Some Love significant airplay for a few months after the album's release, and fans of Yes and Emerson, Lake & Palmer in particular, took notice of the band. Francis Monkman, of the group Curved Air (another group managed by Copeland), was a guest on VCS3 synthesiser on the final track "Rajah Khan".  Hendry was replaced for the Prologue tour by Peter Finberg, who in turn left the group shortly before the sessions for the next album. Michael Dunford then returned as (acoustic) guitarist, completing what most fans regard as the classic five-piece line-up, which would remain together through six studio albums. Ashes are Burning was released in 1973. Andy Powell, of the group Wishbone Ash, was brought in for a blistering electric guitar solo on the final track "Ashes are Burning", which became the band's anthem piece, extended to almost twenty minutes with a long bass solo and other instrumental workouts. (John Tout returned Powell's favour by playing organ on Wishbone Ash's 1972 album Argus.) The album became the band's first to chart in the US, where it reached No. 171 on the Billboard 200. The band played their first US concerts during that period, enjoying success on the East Coast in particular, which soon resulted in a special orchestral concert at New York's Academy of Music in May 1974. Soon Renaissance would choose to concentrate on the US market, as the UK press virtually ignored them.

Answer this question "When was this released?" by extracting the answer from the text above.
Prologue was released later in 1972 on EMI-Sovereign Records in the UK