improvised recording titled "Cambridge 1969", recorded on 2 March 1969 at Cambridge University, before a live audience, which became Lennon and Ono's second performance together, but their first released performance and the first performance by a Beatle without the rest of the band since their main line-up's formation. The piece takes up all of side one and consists of Ono's vocalisations and screaming accompanied by electric guitar feedback from Lennon. Saxophonist John Tchicai and percussionist John Stevens join Ono and Lennon near the end of the piece. Throughout the performance, Lennon kept his back to the audience. The original version of the piece was longer. In a 2010 interview with Cambridge News, Tchicai said that the concert was split in two: the first set was Lennon and Ono, and the other consisted of jazz improvisation players. Recalled Tchicai, Lennon and Ono said to the players: "If you would like to join us for some improvisation, please do." Barnett said that Lennon had been "trying to show off and be more avant-garde than anyone in avant-garde music". Side two of the album was recorded on a cassette tape in their suite at Queen Charlotte's Hospital in London. "No Bed for Beatle John" consists of Lennon and Ono singing the text of press clippings about themselves, including reports of the hospital not giving Lennon a bed to stay in during Ono's miscarriage, and EMI refusing to carry Unfinished Music No.1: Two Virgins because of its controversial sleeve, in a cappella chant style. "Baby's Heartbeat" is a looped infant mortality recording, made with a Nagra microphone, of John Ono Lennon II's ill-fated actual palpitations. Ono first referenced infant mortality in her book Grapefruit, then in her song "Greenfield Morning I Pushed an Empty Baby Carriage All Over the City" from her album Yoko Ono/Plastic Ono Band. "Two Minutes Silence" follows; made as a tribute to composer John Cage's 4'33" in that, similar to Cage's avant garde composition, though Lennon and Ono's track is completely silent. The album closes with "Radio Play", which includes sounds of a radio with brief moments of Lennon and Ono having a conversation and Lennon making a phone call in the background. An edited version of this recording was released on the flexi record that was given away with Aspen. "Song for John", one of the songs that was included on the flexi record, features a "Dear Prudence"-like chord