With the rise of bebop and the end of the swing era after the war, jazz lost its cachet as pop music. Vocalists of the famous big bands moved on to being marketed and performing as solo pop singers; these included Frank Sinatra, Peggy Lee, Dick Haymes, and Doris Day. Older musicians who still performed their pre-war jazz, such as Armstrong and Ellington, were gradually viewed in the mainstream as passé. Other younger performers, such as singer Big Joe Turner and saxophonist Louis Jordan, who were discouraged by bebop's increasing complexity pursued more lucrative endeavors in rhythm and blues, jump blues, and eventually rock and roll. Some, including Gillespie, composed intricate yet danceable pieces for bebop musicians in an effort to make them more accessible, but bebop largely remained on the fringes of American audiences' purview. "The new direction of postwar jazz drew a wealth of critical acclaim, but it steadily declined in popularity as it developed a reputation as an academic genre that was largely inaccessible to mainstream audiences", Burchett said. "The quest to make jazz more relevant to popular audiences, while retaining its artistic integrity, is a constant and prevalent theme in the history of postwar jazz." During its swing period, jazz had been an uncomplicated musical scene; according to Paul Trynka, this changed in the post-war years: