Several people have made the comparison between this lawsuit and Apple v. Samsung, and without opening a can of fanbois, I have to say that I find these two cases differing greatly in merit. In the overall look, it seems pretty obvious that Yamaha was knowingly imitating Beats, which could reasonably be said to cause confusion in the marketplace. (This is, of course, setting aside very valid points about whether Beats ripped off Shure or other companies themselves, among many other issues).
However, I found the Apple v. Samsung comparison to be almost wholly lacking in merit. The summaries and breakdowns presented on Ars Technica really made it seem like Apple was grasping desperately at straws, and I don't think anybody with even a rudimentary knowledge of either operating system (even with Samsung's goddawful TouchWiz interface) would even momentarily confuse one for the other. They are just too vastly different, and any arguments about their similarities could just as easily be made to a number of other products to further underscore the ludicrousness of Apple's position, in my opinion.
But nobody ever introduced me with "His Right Honorable..." in front of my name, so my thoughts here are worth pretty much horseapples. Boo bears.