For about the past year or so, I've been experimenting with alternate tunings. In particular, I've been frequently covering songs tuned a full step down. Lou Reed uses it frequently to put the song into his range, and as such it utilizes a singer's lower register. 90's grunge and heavy metal use it quite a bit, though mostly with electric guitar, not acoustic.
This song, however, was designed to be played on an acoustic guitar and is also the most covered song in the history of recorded music.