1) Sierra was an American Contemporary Christian music vocal trio, founded in 1992 and quickly signed to Star Song, who released their debut self-titled album in 1994. The group released four albums before breaking up in 2002. 2) Sierra is a Japanese R&B singer who has frequently worked with Volta Masters. She released her first album Heavenly U in 2008. 3) Sierra Entertainment, Inc. (formerly Sierra On-Line) was a Worldwide American video game developer and publisher founded in 1979 as On-Line Systems by Ken and Roberta Williams.