 However, Clayton, with his more ambiguous religious views, was less concerned, and so was more of an outsider.In 1995, after the Zoo TV Tour and "Zooropa" album, Clayton headed to New York with bandmate Mullen to receive formal training in the bass; until then Clayton had been entirely self-taught.During that period, he worked on U2's experimental album, released under the pseudonym "Passengers", entitled "Original Soundtracks 1".