There is more than one artist with this name.
1) A Chilean singer-songwriter
2) A Dutch DJ and producer of electronic music
1) Alvaro (Peña-Rojas) is a singer-songwriter from Chile who has released over 18 albums and singles since the 70s. In 1974 he was a founding member of the 101'ers with Joe Strummer. He currently lives in Germany and continues to tour Europe and Latin America.
2)Alvaro (real name Jasper Helderman) is a Dutch DJ and producer of electronic music, both original and remixes. Read more on Last.fm