This is mostly based on the tablature at http://tabs.ultimate-guitar.com/d/ don_mclean/empty_chairs_tab.htm - I'm extrapolating chords from the notes played there, and simplifying a bit when it seems appropriate. You could probably get away with simplifying more, though in the original the guitar is of course very much picking out a full melody.

^GI feel the trembling tingle of a ^Asus2sleepless night^Am ^CCreep through my ^D7fingers and the m^Goon is bright ^GBeams of ^Gmaj7blue c^G6ome flickering through my^Asus2 window pane ^Am ^CLike gypsy moths that ^D7dance around a ^Gcandle flame

And I ^Gwonder ^Asus2if you^Am know That ^Cadd9I never ^D7under^Gstood That ^Emalthough you ^Am7said you'd go ^CUntil you did I ^D7never thought you ^Gwo^Gmaj7uld ^G6 ^Am7 ^Asus4

^GMoonlight used to bathe the contours^Asus2 of your face ^Am ^CWhile chestnut hair fell ^D7all around the p^Gillow case ^GAnd the f^Gmaj7ragrance of your f^G6lowers rest ^Ambeneath my h^Asus2ead ^Am A ^Csympathy bou^D7quet left with the l^Gove that's dead

^GAnd I wonder if you^Asus2 know ^Am ^Cadd9That I ^D7never unders^Gtood That al^Emthough you said you'd ^Am7go ^CUntil you did I ^D7never thought you ^Gwould^Gmaj7 ^G6

^Asus4Never thought the ^Emwords you said were ^Gtrue^Am7 ^D6Never ^Gthought you ^D6said just ^Cwhat you ^Am7mean^Amt ^C ^Dsus2Never k^Dnew how much I ^Gneeded you^Gmaj7 ^G6 ^Am7 Never t^Dhought you'd ^Cleave, un^D6til you ^Amwent ^D6 ^GMorning comes and morning goes with ^Asus2no regret^Am ^CAnd evening brings the ^D7memories I ^Gcan't forget ^GEmpty r^Gmaj7ooms that ^G6echo as I ^Amclimb the ^Asus2stairs ^CAnd empty clothes that ^D7drape and fall on ^Gempty chairs

^GAnd I wonder if you^Asus2 know ^Am ^Cadd9That I ^D7never unders^Gtood That al^Emthough you said you'd^Am7 go ^CUntil you did I ^D7never ^Gthoug^Gmaj7ht you^G6 would

Am7 Asus4 D7 E7 C D C D C D G

Don McLean - Empty chairs