He first joined another metal band, Easy Action, and recorded one album with them "That makes One" . The group eventually split up and Nilsson started a solo career. He represented Sweden in the Eurovision Song Contest 1989 with the ballad "En dag" ("One day") and placed fourth. He has also made several Swedish hits in Sweden; "Allt som jag känner" ("Everything that I feel") (a duet with Tone Norum) in 1987, "Öppna din dörr" ("Open your door") in 1994, "Dina färger var blå" ("Your colours were blue") in 1996, and "Amelia" in 2005. In 1988, he was given an award for best Swedish male artist and in 1994 received a gold disc for his album "En Kvinnas Man".