jazzyfatnastees is a vocal duo, Tracey Moore (born 1970) and Mercedes Martinez (born 1969). The group started as a vocal quartet in 1993, when they landed a deal with Tommy Boy. However, by 1995, the deal had fallen through, the other two members had left, and the remaining duo found themselves in Philadelphia.

Having opened for The Roots in the past, the Jazzyfatnastees were signed to Motive Records, The Roots' imprint at MCA. The duo also provided vocals for OutKast's 1996 single Jazzy Belle during this time.

In 1999, the group released their debut album, The Once and Future. The duo wrote and co-produced the album in conjunction with members of The Roots. Helping to feed the neo-soul movement, the girls started Black Lily, "A Women in Music Series." The series acts as a showcase for neo-soul artists including Alicia Keys, Jill Scott, and Bilal.

In addition to recording their own albums, they have toured with and sung background vocals for The Roots (Illadelph Halflife, Things Fall Apart; Martinez appeared on Game Theory).

The Tortoise and The Hare, the group's second album, was released in September 2002 through Coolhunter/Ryko. Their third album, The World Is Coming, has been released for limited downloading, but has not yet seen wide commercial release.