12 bar blues

David, I am studying the 12 bar blues in level of achievment 3. section 2 applying chords Hole changes. Im working out the different chord changes to holes 1-6. Have you got a jam track I want you with me that has no singing or harp on it so i can really practice the whole changes, i cannot seem to find one. Im probably not looking in the right place. This would be a big help. many thanks