In April 1980, ZZ Top made their first appearances in Europe, performing for the German music television show Rockpalast, later released as Disk 1 of the 2009 DVD Double Down Live: 1980 & 2008[citation needed] and the BBC show The Old Grey Whistle Test.[21] The band shared the BBC's studio with English electronic group Orchestral Manoeuvres in the Dark (OMD), whom Gibbons felt "were great".[22] Inspired by OMD, ZZ Top introduced a jerky dancing style to their live show and began to experiment with synthesizers,[23][24] which featured prominently on the October 1981 album El Loco.[25] The album peaked at number 17 on the Billboard chart, and featured the singles "Tube Snake Boogie", "Pearl Necklace", and "Leila".[26]