...muso "ProfessorofPop" writes on hooks, and why they work.

So if we now look at “Black Dog”, composed and recorded (mostly live – the overdubs are largely Page’s synthetic-sounding hyper-treated guitar parts) when Zep were at the height of their powers, we hear a group that can perform a track with 98 times changes, absent sheet music or a conductor

http://hooksanalysis.wordpress.com/