Acoustic guitar, you can pick it out out but in the rust never sleeps concert he seemed to strum it. Riff part 1 e|---2---0---------------0---------------0---------------0---------| B|-----------3---3---3-------3---3---3-------3---3---3-------3---3-| G|-----------------------------------------------------------------| D|-0---0---0---0---------------------------------------------------| A|-----------------3---3---3---3---2---2---2---2---1---1---1---1---| E|-----------------------------------------------------------------| Riff part 2 e|---0-----0---0-----0---0---0---0---0---0---0---0---0---0---0---0---0-| B|---------------------------------------------------------------------| G|-----------0---0h2---3---2---0-------2---------------1---------------| D|-----0h2-------------------------2-------2---------------2-----------| A|-3-------------------------------------------2---0-----------2---0---| E|---------------------------------------------------------------------| Also when hes singing neil strums the chords C and F then the Esus4 and E in riff part 2 as opposed to the picking. Im pretty sure thats 100% correct.