Jean Claude Ades, also known as Krystal K and J.C.A. is an electronic music producer born in Italy. He has resided and worked in Ireland, France and Germany specialising in house and electro music.

Particularly noted for his work with pop and dance vocalist, Dannii Minogue, Jean Claude Ades co-wrote and produced Minogue's biggest hit "I Begin to Wonder" under the pseudonym J.C.A. and three further tracks, "Come and Get It", "Feel Like I Do" and "Free Falling". He also helped produce the song "Lovers Till the End" with Christian Burns for the album Simple Modern Answers.