When Lennon was invited to play with Frank Zappa at the Fillmore (then the Filmore West) on June 5, 1971, Ono joined them.  Later that year, she released Fly, a double album. In it, she explored slightly more conventional psychedelic rock with tracks including "Midsummer New York" and "Mind Train", in addition to a number of Fluxus experiments. She also received minor airplay with the ballad "Mrs. Lennon". The track "Don't Worry, Kyoko (Mummy's Only Looking for Her Hand in the Snow)" was an ode to Ono's missing daughter, and featured Eric Clapton on guitar. In the late 1960s, while studying with Maharishi Mahesh Yogi in Majorca, Spain, Ono's ex-husband Anthony Cox accused Ono of abducting their daughter Kyoko from his hotel. Accusations flew between the two, as well as the matter of custody. Cox eventually moved away with Kyoko; Ono would not see her daughter until 1998. It was during this time that she wrote "Don't Worry Kyoko", which also appears on Lennon and Ono's album Live Peace in Toronto 1969, in addition to Fly. Kyoko is also referenced in the first line of "Happy Christmas (War Is Over)" when Yoko whispers "Happy Christmas, Kyoko", followed by Lennon whispering, "Happy Christmas, Julian. " The song reached No. 4 in the UK, where its release was delayed until 1972, and has periodically reemerged on the UK Singles Chart. Originally a protest song about the Vietnam War, "Happy Xmas (War Is Over)" has since become a Christmas standard.  That August the couple appeared together at a benefit in Madison Square Garden with Roberta Flack, Stevie Wonder, and Sha Na Na for mentally handicapped children organized by WABC-TV's Geraldo Rivera. 
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