There are at least 9 artists with this name:

1) QuaD is a young musician with exceptional talent, born and bred on the Southside of Ghana. He seeks to make a gilt-edged entry into the world of music. Born Selassi Addaison, but professionally called QuaD. 

2) QUAD is a psychedelic pop band from Brooklyn, NY.

3) Quad was the name of a solo music project by Gary Ramon (Sun Dial).
During his six-year hiatus from Sun Dial, Ramon embarked on an ambitious solo project, Quad, which combined ambient electronica with kraut rock. The result was a pair of self-titled albums. The first of these was released on Ramon's own Acme Records in 1997 as a 1000-copy limited edition on 12" clear vinyl with a transparent sleeve. The second Quad album was released in 1998 on the Prescription label as a 99-copy limited edition LP.

A 1999 American rerelease of the first album on CD and 10" LP on the Man's Ruin label was scheduled but eventually canceled.

Both albums are now highly sought-after collectors' items.

http://www.nationmaster.com/encyclopedia/Quad-(music)

4) DJ Quad

5) Quad was a 1990's alternative rock band that released the album, Bring It On, in 1996.

6) Quad is a Japanese hard dance producer / DJ & recording engineer. Runs the label luvtrax. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.