12 bar blues triangle

https://www.youtube.com/watch?v=Wf9-eiCnYYU
 
-2-12 -2-12 -2-12 -2... -22-1 -22-1 -22-1 -2... -2-12 -22-1 -2-12
-2... -22-1 -2-12 -22-1 -2
2-2-1 2-2-1 2-2-1 2... 2-1-2 2-1-2 2-1-2 2... -2-12 -22-1 -2-12
-2... -22-1 -2-12 -22-1 -2
-12-2 -1-22 -12-2 -1... 2-2-1 2-1-2 2-2-1 2... -2-12 -22-1 -2-12
-2... -4-34 -44-3 -4-34 -4