Welcome to Over50sForum! The site for people over 50 to chat, make friends, discuss, share, and generally be part of something that's fun and friendly :)
Two perfect songs intrinsically connected. Here is what Wikipedia says:
"Black Dog" is built around a call and response dynamic between the vocalist and band, with its start and stop a cappella verses inspired by Fleetwood Mac's 1969 song "Oh Well".
John Paul Jones, who is credited with writing the main riff, was inspired by Muddy Waters' controversial 1968 album Electric Mud. He added a winding riff and complex rhythm changes, a clever pattern that turns back on itself more than once, crossing between time signatures as it does.