I happen to find this on the web, and if you don't already have these live performances from the 70s, this blog is the place to get them:

http://jefitoblog.com/blog/?p=894

The sound quality isn't fantastic, but not bad... In fact, this is the first time I've ever had a chance to listen to any of their stuff live.

Is the guy who runs this blog on this list?  I would like to cyber-shake his hand!  

-Jim
www.paisleypop.com