In light of the recently revived lawsuit over 1980 DeNiro movie, “Raging Bull,” this should be an interesting discussion of laches in copyright suits. In the suit, a trust for the late Spirit band guitarist, Randy California, alleges that back in 1969 the rock legends ripped-off the infamous rift while touring together across the country. California is seeking an injunction to stop a remastered release of the song, monetary reparations, and a writing credit. At issue will be the similarities of the songs, as well as laches and statute of limitation questions.
Might Stairway to Heaven sound like a copy of Taurus, to an ordinary lay listener?
For a detailed history on the suit, see this great article by Bloomberg Businessweek.