 Simpler, rhythmic acoustic parts allowed a focus on Mitchell's voice and emotions ("All I Want", "A Case of You"), while others such as "Blue", "River" and "The Last Time I Saw Richard" were sung to her rolling piano accompaniment.Her most confessional album, Mitchell later said of "Blue", "I have, on occasion, sacrificed myself and my own emotional makeup, ... singing 'I'm selfish and I'm sad', for instance.We all suffer for our loneliness, but at the time of "Blue", our pop stars never admitted these things."