Though the album's dark subject matter is today considered revolutionary, several of the album's songs are centered on themes more typical of popular music. Certain songs were written by Reed as observations of the members of Andy Warhol's "Factory superstars". "Femme Fatale" in particular was written about Edie Sedgwick at Warhol's request. "I'll Be Your Mirror", inspired by Nico, is a tender and affectionate song; in stark contrast to a song like "Heroin". A common misperception is that "All Tomorrow's Parties" was written by Reed at Warhol's request (as stated in Victor Bockris and Gerard Malanga's Velvet Underground biography "Up-Tight: The Velvet Underground Story"). While the song does seem to be another observation of Factory denizens, Reed wrote the song before meeting Warhol, having recorded a demo in July 1965 at Ludlow Street. It had folk music sounds, which were possibly inspired by Bob Dylan.