John Peter "Jay" Semko is a singer/songwriter and bassist with Canadian band, The Northern Pikes.

[1] He is also a music composer for numerous film and television productions, most notably the successful Canadian television series Due South.

Semko has been nominated for a Juno Award eight times as a member of the Northern Pikes, and also been nominated twice for a Gemini Award, and once for a Canadian Screen Award, and received two awards from the Canadian Music Publishers Association for his songwriting.

His hometown is Saskatoon, Saskatchewan.