There are multiple bands/artists under the name Mika.
1) Mika (born Michael Holbrook Penniman in 1983) is a Lebanese-born British singer. He first appeared on BBC Radio 1 in September 2006. He has a background in classical songwriting.
His long awaited first album Life In Cartoon Motion was commercially released on 5th February 2007. It has a coming of age theme, and deals with the transition from childhood to his current position in life. His debut single was Relax