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All Music Guide:
Guitarist, singer, and songwriter Cesar Rosas is a key member of Los Lobos. While less prolific than the team of David Hidalgo and Louis Perez, his rootsy compositions, fiery guitar playing, and gritty vocals act as an important counterweight in the band's sonic blend. Primarily working from a blues-based foundation, Rosas' compositions for Los Lobos include the hard-rocking "Don't Worry Baby" (from How Will the Wolf Survive?) and "I Can't Understand", co-written with blues giant Willie Dixon, which appeared on The Neighborhood (1990). In addition to his role in Los Lobos, Rosas also appeared in 1998 as a member of Los Super Seven, the Latin American supergroup. Their album featured re-interpretations of traditional Mexican folk songs. In 1999 Cesar Rosas released his debut solo album, Soul Disguise, a potent blend of rock, blues, soul, and Mexican music.
César Rosas (born September 26, 1954 in Hermosillo, Mexico) is a singer, songwriter and guitarist for Los Lobos. Rosas also participates in the Latin supergroup Los Super Seven. Perhaps the most recognizable member of Los Lobos, Rosas is known for his trademark black sunglasses and slicked-back, black hair. His singing voice is reminiscent of Chicago electric blues legend John Lee Hooker. His guitar playing is influenced by Jimi Hendrix.
Aside from live shows with Los Lobos, Cesar Rosas has been active as a session musician and sideman during the past several decades. In addition, he has released a solo album in 1999 called Soul Disguise and toured after its release.
Personal life 
The Rosas's have three daughters.
Rosas' wife, Sandra Rosas, was reported missing in 1999. Her half brother, Gabriel Gómez, was tried, convicted of her murder, and sentenced to life in prison without the possibility of parole. Sandra Rosas' body was found on November 22, 2000.