I'm thinking of starting a blog with MP3s ripped from live recordings of various artists' performance from TV programmes.

What are the potential pitfalls of this? primarily legal, but I'm also talking logistical.

Would people be interested? (artists may or may not include, Nick Cave & The Bad Seeds, Portishead and Bruce Springsteen)

Which blog sites would be good for this (I would probably use the blog for other stuff too)?