(Original Version)
Tune down three half steps: E-A-Bm-A E-Bm-A-E (Bm is exchangable with D6)

Standard tuning version: C#-F#-G#m-F# C#-G#m-F#-C# (G#m is exchangable with B6)

(Capo 4) Easy/Capo Version: A-D-Em-D A-Em-D-A (Em exchangable G6)

(Note: this was originally played on a tuned down 12 string with reverb and delay)