produce their second album, Illusions on a Double Dimple with the Cologne Opera House Orchestra, Kurt Edelhagen's brass section and Karl Drewo's saxophone for the Mister Ten Percent suite, as well as a chorus composed of Ulla Wiesmer, Brigitte Thomas, and Hanna Dölitzsch. But that same year, bassist-singer Pape left the band to get married and was replaced by Helmut Köllen, a young guitarist-bassist-singer who was already working with the band as a sound technician and also happened to be Fritz's cousin. The resulting album showcased the work of both bassists, with Pape playing bass on most of side one's Illusions on a Double Dimple suite, and Köllen playing bass and guitar on side two's Mister Ten Percent suite. Köllen also handled vocals for the entire album. Arguably their most accomplished release musically, the album was listed at position 45 in Rolling Stone''' 2015 list of 50 Greatest Prog Rock Albums of All Time. Spartacus and Old Loves Die Hard (1975–1977) In 1975, the trio began recording their third album, Spartacus, a retelling of the story of the famed Roman slave and Thracian gladiator in the year 73 BC. The lyrics were written by drummer Hans Bathelt, with the help of keyboardist Fritz and the album was released on EMI / Electrola, distributed in America by Capitol Records. The album debuted at number 27 on the Billboard album chart. The US tour of Spartacus included many dates opening for Supertramp. Triumvirat was very well-rehearsed, and often out-shone Supertramp on the tour. They also had an element of fun in their live shows that was rare for a prog band. After the album release, Helmut Köllen left to pursue a solo career. He began recording his first solo album with the help of Fritz on keyboards and Hans Bathelt for lyrics on one of the songs, The Story of Life. He did return to the band, who had already composed new songs, but this return was cut short, among other reasons because the new songs no longer suited his tone of voice. He then dedicated himself to his new solo career, which was also cut short when he unfortunately died on May 3, 1977 at only 27 years old. He was listening to a demo tape of his future solo album on his car radio in his garage while the engine was running and died from carbon monoxide poisoning. His completed