During the tour, Bowie's observation of two seminal American proto-punk artists led him to develop a concept that eventually found form in the Ziggy Stardust character: a melding of the persona of Iggy Pop with the music of Lou Reed, producing "the ultimate pop idol". A girlfriend recalled his "scrawling notes on a cocktail napkin about a crazy rock star named Iggy or Ziggy", and on his return to England he declared his intention to create a character "who looks like he's landed from Mars". The "Stardust" surname was a tribute to the "Legendary Stardust Cowboy", whose record he was given during the tour. Bowie would later cover "I Took a Trip on a Gemini Space Ship" on 2002's "Heathen".