Keyboard player and singer Mike Ketley (born 1 October 1947 in Balham, London) started out in Bognor Regis band, The Soundtracks. In 1962, he joined Johnny Devlin & The Detours and later was a member of Beau Brummell & The Noblemen with Bryan Stevens.

In 1966, Ketley and Stevens formed a new group, The Motivation, which evolved, with various line up changes, through The Penny Peeps and Gethsemane. The groups are best known as the training ground for future Jethro Tull guitarist Martin Barre and also included Malcolm Tomlinson.

When Gethsemane broke up in December 1968, he returned to Bognor and later played bass with The Concords.

He is Senior Director of the instrument wholesaler, Yamaha Kemble Music UK Ltd.