After graduating in 1996, he began his studies at the Chișinău Music Conservatory and taught vocal classes for children on the side.

In 2001, Sîrbu was selected to be a member of O-Zone during a casting session organized by the Moldavian singer Dan Balan.

[2] After its release in Italy at the beginning of 2004, the song became a hit across Europe and topped the Eurochart Hot 100 for twelve weeks.

[3] Dragostea Din Tei reached the first position in the French,[4] German,[5] Belgian,[6] Swiss,[7] and Dutch[8] charts at the end of 2004.

In January 2005, the trio announced that O-Zone would be disbanded and that they had planned to focus on their respective solo careers.

[citation needed] Balan would move to the United States with his rock band 'Balan', while Todiras launched a solo career in Germany under the name Arsenium.

He changed his stage name to RadU, and currently lives in Romania with his wife, Ana Sîrbu, and their children.