There is more than one artist with this name:

1) Millenium is a progressive rock group from Poland.
http://www.millenium.art.pl/
http://www.myspace.com/milleniumpoland

2) Millenium is a Polish electronic group from Piła. It was founded in 1993 by two producers: Phobos & TR. Their first songs were only trance & techno.

3) Millenium is Heavy Metal band from Bangalore, India. The band was formed in 1988 in Bangalore by Rio on the guitars, Roberto on the drums, Vehrnon as the vocalist and Stanley on the bass and Cecil on the guitar. They were also the openers for Deep Purple and Megadeth/Machinehead in India.

4) Millenium is a pop‑rock group from Moldova. The band took part in the Moldovan national final of the 2010 Eurovision Song Contest with the song «Before You Go».

5) Millenium is a Melodic Heavy Metal group from the United States. Altough some of the members are from other countries. They were formed in 1997 and have released 4 albums so far. Millenium (1997), Angelfire (1999), Hourglass (2000) and Jericho (2004). One compliation album has also been released in 2004.

6) Millennium were a Gothic Metal group from Almada, Protugal. They formed in 1995 and released a demo in 1997 called «Wilderness In White». They split up shortly after.

7) Millennium was a collegiate barbershop group from Northwest Missouri State University, who won the International Collegiate Championship in 2000.