Kārlis Būmeisters (born December 13, 1986, in Riga) is a Latvian musician, artist, guitarist and TV host once using the stage name Kaža.

In 2004 the band toured under the slogan "Dziesma manai paaudzei" meaning "Song for My Generation".

The band released two albums: Sapņu pārdevējs (meaning Dream seller) and Mr. Andersen nemelo In Eurovision Song Contest 2005, he represented Latvia with the song "The War Is Not Over" in a musical formation Valters and Kaža with the artist Valters Frīdenbergs.

After Eurovision, in 2008, he founded his solo project, winning "Music Record of the Year" during Muzikālā banka Awards.

Būmeister studied at Riga V. Zālītis Primary School, then went to Āgenskalna Valsts Gymnasium.