Born in Watford, Hertfordshire, the son of actor and entertainer Davy Kaye, Kaplan 'Kap' Kaye trained at the Corona Stage Academy. His television debut was as Young Scrooge in an adaptation of A Christmas Carol (1958), part of the Tales from Dickens series. Other television appearances include roles in The Charlie Drake Show (1961), Henry in six episodes of William (1963), Eagle Rock (1964), The Saint (1964), the mini-series The Three Musketeers (1966), Armchair Theatre (1967), Z-Cars (1968), The First Lady (1968), and Journey to the Unknown (1968).
Theatre appearances include Oliver! (1960), Siddy Blitztein in the original production of Blitz! (1962) by Lionel Bart, and 'Puck' at the Royal Opera House in Covent Garden in Benjamin Britten's A Midsummer Night's Dream (1966) The latter performance was issued as an album.
With Roger Kitter he co-wrote and performed on the hit song Chalk Dust - The Umpire Strikes Back, which reached No. 19 in the UK charts in July 1982. In 1989 Kaye, with Harry Schulz, released a remix of the Flash and the Pan song Waiting for a Train titled "Waiting for a Train '89 (The Harrymeetskaplan Mix)", and released in the UK on Cha Cha Records. In 1994 Kaye won the British Academy of Songwriters, Composers and Authors (BASCA) award for ‘Best British Song' at the Cavan International Song Festival with his song ‘You Will Find Me There'. Kaye co-wrote the song "If I Was President", which was recorded by Wyclef Jean, and also worked on the song "Take Me With You", which was recorded by L.L. Cool J and featured 50 Cent in 2009. With Bill Dare he is half of the ukulele duo 'The Ukaye Ukes'.
- Kaye on the Internet Movie Database
- Kennedy, Michael Patrick and Muir, John, Musicals, HarperCollins, 1997, updated reprint 1998, ISBN 0-00-472067-9
- A Midsummer Night's Dream - 1 January 1966 Evening - Royal Opera House Collections Online
- A Midsummer Night's Dream (1966) on Operadis website
- Credited to The Brat.
- 'What becomes of the one-hit wonders?' - The Guardian
- Kaye on the 'Roots, Ukes and Toots' website
- Kaye on The Ukaye Ukes website
- Kaye on the Grand Order of Water Rats website