Riff Wiki:Copyright and takedowns
If you hold the rights to a song and find a transcription of it here, write to abuse@riffwiki.com with the page title and the work concerned. The transcription is taken off the page. What that does not do is unwrite it: a wiki keeps every earlier version of a page in its history, and that is as true of a page that has just been cleared as of any other. You do not need a lawyer to write that mail, and there is no form.
The same address takes reports of personal information published without consent, and of anything unlawful. Ordinary mistakes and vandalism are better fixed by editing the page or restoring an earlier revision from its history.