Stevie Ray Vaughn doing a sound check with his band in 1986, right after he woke up. You can see him yawning trying to get woke up and then it's like someone flipped a switch! About 17 minutes of pure Stevie Ray with no background noise from a crowd. You can really see and hear him hit the licks.
From the Youtube page;
Published on Apr 12, 2013
"Stevie just waking up then warming up. Insane how good can you really be that tired? Turn it up and enjoy. Original Source: This was filmed Jan 1986 by Greg Savage of Savage Guitar Design and is used with permission.