@britneymania2.0: In 2008, Lady Gaga wrote the song specifically with Britney in mind for her comeback album, Circus. Britney actually went into the studio and recorded a full vocal demo for the track. Despite recording it, Britney’s team ultimately rejected the song. The main reason cited was that the album already had a "phone-themed" song—"Phonography"—and they felt including both would be redundant. The demo of Britney singing "Telephone" leaked online in May 2010, just as the Lady Gaga and Beyoncé version was dominating the charts. The leak was so massive that it became one of the most illegally downloaded files of that year. #britneyspears #ladygaga #beyonce #telephhone #foryou