Just released : a Various Artists compilation CD with 21 versions of "Mr Tambourine Man".

There are, among others, versions by "The Byrds With Bob Dylan", "The Byrds (new recording)", "Roger McGuinn (electric guitar)", "Roger McGuinn (acoustic guitar)", "Chris Hillmann" (sic) and "Gene Clark".

I have more than serious doubts about the legality of such a release.