Here are some great questions someone just asked. If you have any questions, let me know! I'll add more to this list as they arise.
1) What was the basis of the music. Is it just based on meter and extrapolated from ancient instruments?
I'm not a musician, and so I haven't in any way set the hymns to music. There have, over the years, been several attempts to "reconstruct" how the Orphic Hymns were sung. However, I think it's most likely that, in ancient days, different people sang them very differently, some of them preforming them as simple spoken word invocations, and some singing them to a variety of tunes accompanied by a lyre (a small harp). The Orphic Hymns were, even if not in this exact form, likely preformed all over the Mediterranean for many generations, and many different styles likely arose
2) Also why rhyming lines as the original obviously didn't rhyme? Is it just because it feels more comfortable to English speakers?
I chose (mostly) iambic rhyming couplets (called "heroic verse") for a couple of reasons: 1) rhyme and meter can help lull the mind into trance, and that makes them very powerful for magical work.
2) heroic verse is called that because it's been the English poetical form that has traditionally been used to translate dactylic hexameter of ancient Greek epic poetry. That means that, in most readers' subconscious, this form is what "ancient Greek stuff" sounds like.