The Kojacks perform dressed in bald wigs, jaunty hats, sunglasses, and leisure suits resembling the attire of the television detective. They belt out tunes a la Telly Savalas ("Kojak") with a touch of Frank Sinatra thrown in for good measure.
The Kojacks recorded an entire CD of tunes written by (or made famous by) Harry Nilsson called The Kojacks Roast Nilsson. The album is available on CD at: https://www.onlythebestcds.com/cds/cdm135.html