I dont think those 5 are cylons, I think it's a Red Herring. If anyone remembers the original TV series. There were actually 4 sets of protagonists, that appeared in the show. The Colonials, Cylons and two ancient races. One of these beings appeared as a fallen angel, played by Patrick McNee. The others beings, were a kind of divine race who would appear briefly to help the main good guys.
In fact (IIRC), Starbuck dies in one episode, and these divine beings whick him away. Along with Apollo, and some other crew member (Athena?). Anyway, while on this Divine craft, everyones gear appears as a bleached pale version of its real world self. I think the guns were white, and would not function.
Starbuck is ressurected, and the beings offer some in navigating back to Earth.
I think these same beings, are the ones who have been subtly pointing the Colonials back to Earth, and this 'music' was possibly some sort of epithany or divine signal.
As for the 5, well I think they still have to show their face and I think its more than likey going to have Laura Roselyn there (since she can share a projection).
@ Cordas I just wonder what a classic Jimmy Hendrix song is doing in the Colonial fleet
