Set Default music player to Banshee, yet it's still Rythmbox?

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http://askubuntu.com – I kind of have two questions, that tie into each other. I want to set Banshee as the default music player. It seems simple enough. Go to "systems settings > Details > Default Applications" and change "Music"from "Rhythmbox" to "Banshee". But, this did not work. How do I make this work? How do I uninstall Rhythmbox? I tried uninstalling it from the Ubuntu Software Center, yet Rhythbox updates still showed up in my "System Updates." I don't want that. Thanks! (HowTos)