CBC agreement with talent agency prohibits use of Creative Commons music

According to a comment from a CBC producer on a message board, the Canadian Broadcasting Corporation has banned the use of Creative Commons licensed music from its podcasts. Apparently, this goes "against some of the details in collective agreements [the CBC] hold with certain talent agencies."
In other words, groups are actively working to block the use of Creative Commons licenced alternatives in their contractual language. It is enormously problematic to learn that our public broadcaster is blocked from using music alternatives that the creators want to make readily available. The CBC obviously isn't required to use Creative Commons licenced music, but this highlights an instance where at least one of its programs wants to use it and groups that purport to support artists' right to choose the rights associated with their work is trying to stop them from doing so.
CBC Bans Use of Creative Commons Music on Podcasts