Riff/Melody Used to End Songs

Is there a name for this riff that is often used to end songs, typically blues and blues-based songs? What is its first known appearance?

For some reason YouTube won’t let me play that example in the UK?

Any other instances?

Artists often vary it but there’s a common underlying structure.

the Beatles “For You Blue”
the White Stripes “Death Letter” (Son House cover)
Reverend Horton Heat “Bad Reputation”
Prince “Let’s Go Crazy”
Bill Haley and His Comets “Rock Around the Clock”

Don’t forget to add the ninth chord!

I think it’s a “blues turnaround”—used not just for ending songs, but also to transition and restart the sequence of bars.

Definitely a turnaround, though I’m not up on them enough to know what that specific one is called.

Moderating

Since this is about music, let’s move this to Cafe Society (from FQ).