I don't really know what the riff is played on, or in which tuning, but I suspect it's something like a 5-string acoustic bass. Something worth a good discussion I think.. I just did two versions: One for an acoustic guitar (which sounds quite nice) and one for a.. 5-string bass ----------------------------------------------------------- ----------------------------------------------------------- A --------2--------------------2-----------2-----------0h2--- E ------0---0----5-----------0---0----5------3--0--2h3------- --3h5-------3--3-----3-3h5-------3--3---------------------- Acoustic E ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- A --------2-----0-----------2-----0--2---------0h2- --0h2-2---2-0-0---0-0h2-2---2-0-0----5-2-4h5-----