This is one of the many 12 bar blues. This is the first one that my guitar teacher taught me. This can be played absolutely anywhere on the neck but I practice is in the A position. e:---------------------------------------------------------------------------------------------------------| G:---------------------------------------------------------------------------------------------------------| B:----------------------------------------------------------5-5-7-7------5-5-7-7---------------------------| D:-----5-5-7-7------5-5-7-7------5-5-7-7------5-5-7-7----7-7----------7-7-------------5-5-7-7------5-5-7-7-| A:--7-7----------7-7----------7-7----------7-7--------5-5----------5-5-------------7-7----------7-7--------| E:55----------5-5----------5-5----------5-5-------------------------------------5-5----------5-5-----------| e:----------------------------------------------------| G:----------------------------------------------------| B:-----7-7-8-8------5-5-7-7---------------------------| D:--8-8----------7-7-------------5-5-7-7------5-5-7-7-| A:77----------5-5-------------7-7----------7-7--------| E:-------------------------5-5----------5-5-----------| Repeat as needed. This very famous and used in many blues songs. I love it!