In 1979, ZZ Top signed with Warner Bros. Records and released the album "Degüello". While the album went platinum, it only reached number 24 on the "Billboard" chart. The album produced two popular singles: "I Thank You", a cover of the David Porter/Isaac Hayes composition originally recorded by Sam & Dave, and the band original "Cheap Sunglasses". The band remained a popular concert attraction and toured in support of "Degüello". In April 1980, ZZ Top made their first appearance in Europe, performing for the German music television show "Rockpalast". The band later played the BBC show "The Old Grey Whistle Test", where they shared a studio with English electronic band Orchestral Manoeuvres in the Dark (OMD). ZZ Top became fans of OMD's synthesizer-driven music and adopted elements of their energetic performance style, before themselves experimenting with synthesizers on the October 1981 album "El Loco". The album peaked at number 17 on the "Billboard" chart, and featured the singles "Tube Snake Boogie", "Pearl Necklace", and "Leila".