Blues
robert-johnson_1
https://www.google.cz/search?q=blues&ion=1&bav=on.2,or.r_qf.&bvm=bv.47244034,d.Yms&biw=1280&bih=880&um=1&ie=UTF-8&hl=cs&tbm=isch&source=og&sa=N&tab=wi&ei=WvOtUaOPKs2RswaJqIDIDg#facrc=_&imgrc=Ud0R03jSNcEMHM%3A%3BdJ7aAiH5oWkvDM%3Bhttp%253A%252F%252F4.bp.blo