Personal relationships of Paul McCartney "gave me the strength and courage to work again", after the break-up of the Beatles. McCartney adopted her daughter from her first marriage, Heather, and had three children together: Mary, Stella, and James McCartney. McCartney taught Linda to play keyboards, and permanently included her in the line-up of Wings. Linda died of breast cancer at age 56 in Tucson, Arizona, on 17 April 1998; McCartney denied rumours that her death was an assisted suicide. Along with eight other British composers, he contributed to the choral album "A Garland for Linda", and dedicated his classical album, "Ecce Cor Meum", to his
Paul McCartney in 1968, the two got into an argument over McCartney's critique of Starr's drum part for "Back in the U.S.S.R.", which contributed to Starr temporarily leaving the band. Starr later commented on working with McCartney: "Paul is the greatest bass player in the world. But he is also very determined ... [to] get his own way ... [thus] musical disagreements inevitably arose from time to time." McCartney and Starr collaborated on several post-Beatles projects starting in 1973, when McCartney contributed instrumentation and backing vocals for "Six O'Clock", a song McCartney wrote for Starr's album "Ringo". McCartney played a kazoo solo