Da Capo is short and all, but it might mean nothing to most folks if they don't know music that well. Over here it sounds like someone with a New York/New Joisey(Jersey)accent (no offence NY&NJers!) Actually, it reminds me of the mafia in that over here the "godfather" might be addressed as "Da Capo" as in "The Head." Just my take on it.:-)

As to the others, not being familiar with the songs, they are not really indicative to me of what your duo would be unless I had more material to read or listen to.

Not meaning to sound biased, but maybe combine Da Capo with Rides Again or one of the others with it?

If you want to use "500" why not get fancy and use "The Quingenti Duo?" Or, "Rise of the Quingenti?" Or "Quingenti Rides Again," though I don't think that is as descriptive as the QD...ah! Great acronym for it!

I think "The Quingenti Duo" sounds like something from one or all of those eras, plus it sounds classy without being snobby, esp. if you use "QD" as a familiar reference.

Thanks, again, for the fun of this!

kat