Bacchante Lyrics
Bacchus was the ancient Roman god of wine, but was often associated with sex and lust. Celebrations were held in his honour, in which everyone got drunk and had wild orgies. Though legitimate events in the Roman religious calendar, these celebrations were frowned upon and eventually banned, which didn't stop them continuing in secret for some time to come.
And no, I don't know what that has to do with the song.
This song, to me is about secret celebrations in the dark. Occult, eroticism, darkness... There is also the holy effect implied by "Bacchari" as Viro pointed out and the pagan traditions, as suggested by the word "witchery". He is writing something. That can be taken metaphorically as "he is living his life". This song is very specail to me...
Definitely about Bacchanalia, the ancient Rome celebrations in honour of Bacchus (at least the literal meaning). "An ivy-crown'd and dancing, and fawn'd and trancing". "Bacchante" is a woman who takes part in Bacchanalia.