Conversation so far:
What was Casbah Rock with The Undertones?
By 1977 the band were performing their own three-chord pop punk material, which was performed alongside cover versions at concerts, primarily at the Casbah
What songs did The Undertones perform at the Casbah?
By mid-year, the concerts the Undertones performed would include the song Teenage Kicks, which had been written by guitarist John O'Neill in mid-1977.

Question: Was that song released as a single?
Self-contained rewrite: Was the song Teenage Kicks released as a single?