Spoonful - Howlin' Wolf

The original, and still greatest: https://www.youtube.com/watch?v=4fjviTLYqoc

but it's been covered by everybody.

Willie Dixon, who wrote the song, and whose wikipedia page you should absolutely read to see how influential he was, recorded his own version: https://www.youtube.com/watch?v=6HMafOfhAus

Etta James: https://www.youtube.com/watch?v=jeeot1j3KeM

This live version of Cream's famous cover is great enough that I'll link it even though I think Eric Clapton is vile: https://www.youtube.com/watch?v=n8a2YxEmHmU

Here's a weird version from Robert Plant in 2013: https://www.youtube.com/watch?v=89V_-7UELko

Tom Waits: https://www.youtube.com/watch?v=Q1wHKW227hI