There are at least four artists with this name:
1) DIA (디아) is a South Korean female singer. 2) DIA is a finnish modern rock band from Jyväskylä, Finland. It was founded in 2005 and so far has released demos and an LP fully downloadable from their website: http://www.ilta.fi 3) Integration is the new, self-released album by Dia (Shawn Brice and Maria Azevedo of Battery.) What began as a one-time project by has developed into an ongoing musical endeavor: written, recorded and produced by two members of the band that brought you such memorable albums as Aftermath, Distance and nv.

Read more about Dia on Last.fm.