Showing how cool they were Led Zeppelin releases an album this week in 1971 that has no mention of their name on the cover. Their LP had only a photo of a painting (an old man with a bundle of branches on his back) hanging on a tattered wall.
A lot of fans and even critics say this is Led Zeppelin best album.
Here's Led Zeppelin doing Black Dog track one from the album live in New York City in 1973.

RHINO via YouTube