Charles Oberthur is not a widely recognized musical artist in contemporary music history, and there may be some confusion surrounding the name. It's possible you are referring to a lesser-known musician or a local artist. However, notable figures in music history with similar names include Charles Ives, an influential American composer known for his innovative techniques, and Charles Mingus, a prominent jazz bassist and composer. If you have a specific context or other details about Charles Oberthur, please provide them, and I would be happy to assist you further. Otherwise, I can help with information on more widely recognized artists in various genres.