After the 1975 "Autobahn" tour, Kraftwerk began work on a follow-up album, "Radio-Activity" (German title: "Radio-Aktivität"). After further investment in new equipment, the Kling Klang Studio became a fully working recording studio. The group used the central theme in radio communication, which had become enhanced on their last tour of the United States. With Emil Schult working on artwork and lyrics, Kraftwerk began to compose music for the new record. Even though "Radio-Activity" was less commercially successful than "Autobahn" in the UK and United States, the album served to open up the European market for Kraftwerk, earning them a gold disc in France. Kraftwerk made videos and performed several European live dates to promote the album. With the release of "Autobahn" and "Radio-Activity", Kraftwerk left behind avant-garde experimentation and moved towards the electronic pop tunes for which they are best known.