Bowie supported the album on the Diamond Dogs Tour, whose first leg lasted from 14 June to 20 July 1974. Co-designed and constructed by Chris Langhart, it featured elaborate set-pieces and cost $250,000. Fritz Lang's "Metropolis" (1927) and Robert Wiene's "The Cabinet of Dr. Caligari" (1920) influenced the tour's design, primarily due to Bowie's interest in German expressionism. The tour's second leg, from 2 September to 1 December 1974, has been nicknamed the Soul Tour, because of the influence of the soul music Bowie had begun recording for "Young Americans" in August. The shows were altered heavily, and no longer featured elaborate set-pieces, partly because Bowie had tired of the design and wanted to explore the new sound he was creating. Bowie dropped songs from the previous leg, while he added new ones—some from "Young Americans".