I found this on the web
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Songbird
The other night, we caught the tail end of a programme about Fleetwood Mac, which showed a clip of Christine McVie performing Songbird, her own composition. I was struck by how inferior her version was to the Eva Cassidy version that most people are familiar with. I wondered: what’s it like to compose a song that is then performed much better by someone else? Do you feel aggrieved that they've taken something that belongs to you and made it their own? Or do you feel thrilled that they’ve been able to do something with your composition that you couldn't?
It's not that there’s anything wrong with Christine McVie’s version, incidentally. It’s just that Eva Cassidy would have made The Wheels on the Bus sound sublime.
Anyway, judge for yourself:
Christine McVie:
http://uk.youtube.com/watch?v=3kHg3w...eature=related
and
Eva Cassidy:
http://uk.youtube.com/watch?v=AFFo1pu4q7Q
http://kimthomas.livejournal.com/7285.html