rock duo in the world. Simon was approached by numerous film producers who wished him to write music for their films or license a track; he turned down Franco Zeffirelli, who was preparing to film Brother Sun, Sister Moon, and John Schlesinger, who likewise was readying to shoot Midnight Cowboy. In addition to Hollywood proposals, producers from the Broadway show Jimmy Shine (starring Simon's friend Dustin Hoffman, also the lead in Midnight Cowboy) asked for two original songs and Simon declined. He eventually paired with Leonard Bernstein, with whom he collaborated for a short time on a sacred mass (he eventually withdrew from the project, "finding it perhaps too far afield from his comfort zone"). Disc jockey and author Pete Fornatale writes that Bookends represents "a once-in-a-career convergence of musical, personal, and societal forces that placed Simon & Garfunkel squarely at the center of the cultural zeitgeist of the sixties". Rolling Stone credited the record with striking a chord among lonely, adrift young adults near the end of the decade, writing that a lyric in "A Hazy Shade of Winter"—"Time, time, time, see what’s become of me..."—"defined the moment for a generation on the edge of adulthood". Many viewed Bookends as the band's most accomplished work at the time, a breakthrough in production and songwriting. "Bookends was our first serious piece of work, I'd say", said Simon in a 1984 interview with Playboy. In 2010, "All gone to look for America"—a reference to a line from the song "America"—began appearing spray-painted on vacant buildings and abandoned factories in the town of Saginaw, Michigan, which is mentioned in the song. A loose group of artists, who eventually became known as "Paint Saginaw", began duplicating the phrase after the city population had dwindled vastly, noting that the song now encapsulated a sense of nostalgia for a bygone era among the city residents. "America" was also featured in an eponymously-titled television advertisement for the presidential campaign of Bernie Sanders during the 2016 Democratic Party presidential primaries. The campaign sought permission to use it from Paul Simon and Art Garfunkel themselves, who both agreed. Garfunkel stated that he was a supporter of Sanders and his campaign, and that the usage of "America" did not take away from the song's original premise. Bookends was the last Simon & Garfunkel album to be mixed in separate mono and stereo mixes, as manufacturing of mono LP's alongside