Audio Hijack for Mac lets ya record up to 10mins of Audio per session without registering.

Noise starts after 10mins - but you can close & restart it again. No probs.

Agree with Quark, its cool for messing around with the tune if you just want to take a look at it. Quality from YT is not something that would make you want to do it for any other reason than that.

Besides - it takes up far too much time. Life is too fkn short! ; )