There is more than one artist with this name.

1) 'nada' — electronic/ambient music by Steve Grainger [http://www.myspace.com/nadasonic].
2) Gidi Raz & Koby Levi. [http://www.discogs.com/artist/Nada]
3) Finnish group founded by composer Eero Hämeenniemi, that fuses elements of modern jazz, contemporary chamber music and world music.
4) Venezuelan Punk Hardcore Band.
5) Costarican alternative rock band.
6) Italian singer Nata a Gabbro (born 1954).
7) Rapper and beatmaker from finland [http://www.myspace.com/nadabeats]
8) Maybe a german Punkband (Taugenix Sampler #2).
9) The collaboration project between Humphrey Bacchus & Russel Davies.
10) Turkish alternative/electronic pop‑rock group. [http://www.myspace.com/nadaist]
11) Experimental / Ambient Project helmed by Rob Riddle with various contributors including Scott Martinez (Autumn Cathedral), Damien Gonzalez (Swivelfaust, Slur) and Mason Jones (Trance). They had one release «awkward y borracho core del todo» on Flying Esophagus Productions — distributed by Charnel House.