Junior Kimbrough - Sad days lonely nights

Hello, this is my first tab, I think is not so bad, sound better than the others ones I found on the net. This is the main riff, ad variations eb|--------------------------------------------| Bb|--------------------------------------------| Gb|----------5h7-5---5-------------5h7-5-------| Db|--7---7---------7-------7---7-----------7---| Ab|----0---0-----------------0---0-------0-----| Eb|--------------------------------------------|