Owing to machinations over at feedburner, who have recently been consumed by the all powerful Google empire, the Music and Mumblings 'feed' has changed a little. This change is, in most cases, completely 'transparent to the user', but it does affect some things, like the little player you see on the right of the site here.
The old feed was http://feeds.feedburner.com/MusicAndMumblings
And the new one is http://feeds2.feedburner.com/MusicAndMumblings
So, if you're off your feed, maybe you need number twos....