classic blues riff

44 55 66 -6-6 77 -6-6 66 55 (x2) 
    -5-5 -6-6 77 -8-8 -9-9 -8-8 77 -6-6 
        44 55 66 -6-6 77 -6-6 66 55
               44 55 66 55
           -3-3 -4-4 -5-5 -4-4
           77 -6-6 66 55 4 4 4