Kevin Ayers was one of rock's oddest and more likable enigmas, even if he often seemed not to operate at his highest potential. Perhaps that's because he never seemed to have taken his music too seriously -- one of his essential charms and most aggravating limitations. After the late '60s, he released many albums with a distinctly British sensibility, making ordinary lyrical subjects seem extraordinary with his rich low vocals, inventive wordplay, and bemused, relaxed attitude. Apt to flavor his songs with female backup choruses and exotic island rhythms, the singer/songwriter...