C or D:: the Guess Who

This is the most generic story imaginable--rock stars sue former bandmates--it's just funny to see Cummings and Bachman on the same side. They feuded for years. Not that that's unusual either.

https://www.thestar.com/entertainment/music/randy-bachman-writes-about-split-with-burton-cummings/article_5938f364-7e7f-5223-828a-14e54fc58a82.html

Using Jefferson Airplane/Jefferson Starship/Starship as a precedent, judge rules that one party may continue as the Guess Who, while the other must henceforth use "the Who." More lawsuits ensue.

Bachman sued his own brother/bandmate, this is no big deal for him.
He and Cummings could provide case histories for a whole semester’s worth of music business horror stories like these.