A federal judge dismissed a lawsuit against heavy metal rock singer Ozzy Osbourne, ruling that a couple cannot prove their teenage son's suicide was caused by listening repeatedly to Osbourne's music.

U.S. District Judge Duross Fitzpatrick also ruled the music is free expression protected by the First Amendment of the Constitution.Thomas and Myra Walker of Fitzgerald, Ga., contended in a $9 million suit that their son, Michael, 16, committed suicide in 1986 after repeatedly listening to "Suicide Solution" from Osbourne's "Blizzard of Oz" album. A tape of the song was found in the cab of Michael's Datsun pickup several days after his death.

Fitzpatrick also had rejected the analysis of expert witness Victoria Evans that a subliminal message was contained in a 28-second instrumental break on the song.