Martin decided to use an old 8-track analogue mixing console – which EMI learned an engineer still had – to mix the songs for the project, instead of a modern digital console. He explained this by saying that the old console created a completely different sound, which a new console could not accurately reproduce. He also said he found the whole project a strange experience, as they had to listen to themselves chatting in the studio, 25–30 years previously. Martin stepped down when it came to producing the two new singles reuniting McCartney, Harrison, and Starr, who wanted to overdub two old Lennon demos. Martin had suffered a hearing loss, so he left the work to writer/producer Jeff Lynne of the Electric Light Orchestra. In 2006, Martin and his son, Giles Martin, remixed 80 minutes of Beatles music for the Las Vegas stage performance "Love", a joint venture between Cirque du Soleil and the Beatles' Apple Corps Ltd. A soundtrack album from the show was released that same year. Martin's contribution to the Beatles' work received regular critical acclaim, and led to him being described as the "Fifth Beatle." In 2016, Paul McCartney wrote that "If anyone earned the title of the fifth Beatle it was George". In the immediate aftermath of the Beatles' break-up, a time when he made many angry utterances, John Lennon trivialised Martin's importance to the Beatles' music. In his 1970 interview with Jann Wenner, Lennon said, "[Dick James] is another one of those people, who think they made us. They didn't. I'd like to hear Dick James' music and I'd like to hear George Martin's music, please, just play me some." In a 1971 letter to Paul McCartney, Lennon wrote, "When people ask me questions about 'What did George Martin really do for you?,' I have only one answer, 'What does he do now?' I noticed you had no answer for that! It's not a putdown, it's the truth." Lennon wrote that Martin took too much credit for the Beatles' music. Commenting specifically on "Revolution 9", Lennon said, "For Martin to state that he was 'painting a sound picture' is pure hallucination. Ask any of the other people involved. The final editing Yoko and I did alone." In 1971, Lennon said, "George Martin made us what we were in the studio. He helped us develop a language to talk to other musicians." According to Alan Parsons, he had "great ears" and "rightfully earned the title of "Fifth Beatle".