Anthony Cruz, better known by his stage name AZ, is an American rapper. Best known for his affiliation with hometown native and fellow East Coast rapper Nas, they formed the New York City-based hip hop group the Firm with Foxy Brown, Cormega and Nature in 1996. Cruz first saw recognition for his guest appearance on Nas' 1994 single "Life's a Bitch" from his album Illmatic (1994). Cruz was then signed by EMI to release his debut studio album, Doe or Die (1995), which was met with critical acclaim. Its lead single, "Sugar Hill" peaked at number 25 on the Billboard Hot 100 and received gold certification by the Recording Industry Association of America (RIAA). Moreover, The Firm's sole album (1997) peaked atop the Billboard 200 chart despite unfavorable critical response; the group disbanded two years later.

Rapping is an artistic form of vocal delivery and emotive expression that incorporates "rhyme, rhythmic speech, and [commonly] street vernacular". It is usually performed over a backing beat or musical accompaniment. The components of rap include "content", "flow", and "delivery". Rap differs from spoken-word poetry in that it is usually performed off-time to musical accompaniment. It also differs from singing, which varies in pitch and does not always include words. Because they do not rely on pitch inflection, some rap artists may play with timbre or other vocal qualities. Rap is a primary ingredient of hip hop music, and so commonly associated with that genre that it is sometimes called "rap music".