There are 112 videos if you do a search for "Seth Lakeman" on YouTube.

I think the YouTube complaining system requires the complainer to be the actual copyright owner and say they are. It obviously does work to some degree because you occasionally find the message that content has been removed because of a complaint. Normally you see that happen mainly on TV footage. There were a whole load of clips of The Brits that got taken off when ITV or the BPI complained. The BBC also seem to have had a bit of a purge recently. The infamous Jonathan Ross interview with David Cameron has dissapeared, along with several other things that had ben there for ages. I guess that is probably all part of the BBC now having an official deal to provide YouTube with official content.

Yes, the sound quality on many mobile phone originated clips is downright diabolical!