MM has had a checkered past the company was put out of business for producing tracks and not obtaining the proper license to do so from the copyright holder of the material. I heard that the President of the company actually went to jail for a time, of course I have no real hard data as to that. They have some good material in their library especially 50's and of course the Velvet Elvis series. I think most hosts are pretty much in the same boat that wish to be legal. You can try as hard as you can to keep your material between the lines, and still you can end up with tracks in any library that are questionable, as far as their legality. The way most hosts cover themselves is to keep their original discs and all paperwork on their purchases. Even taking those steps will not protect you if some copyright holder decides to sue you. The chances of that are small, however, so far. Only SC/CB/aka PEP are using the legal approach, and that is mainly directed against venues now, since the average pirate doesn't have two dollars to rub together. If other copyright holders such as publishers decide to start suing then it could be the end of professional public karaoke hosting. Since you are not commercial but working in the non profit sector I don't think you would have much of a problem, getting sued. Just my opinion of course. I'm retired from active commercial work and just do a gig now and then. In over 19 years of hosting I was never sued.