The group that collects royalties for songwriters is taking aim at an unusual source: dentists. It's not just dentists, but chiropractors and opticians -- any kind of office space that plays CDs. "This was a money grab, what is the legitimacy of this kind of request of a license for this purpose," asks Dr. Jack Cotrell of the Canadian Dental Association. The idea that music is in the public domain is a longstanding one, but it's also completely wrong, according the a musicians' rep. "Not only is it the right thing to do, but it's also the lawful thing to...