Thank you very much for the post.
I am sorry, but I have to correct some stuff
(I know I am self-opinionated):
I know the "Harp of David" from the net, too.
This harp is a lyre, not a harp. And it is a modern instrument,
I own one myself. It has much more strings than any ancient lyre.
the last video:
The Epithath of Seikilos is not the oldest complete written song
in the world. To claim that makes it absolute.
Most people might not read the word "complete" n think it
is just the oldest one. The songs of Mesomedes are mostly
complete as well and date to the early 2nd cent.
We have a lot more older songs. Mostly not complete, yes,
but with a lot of notation n texts, so makes you able
to sing and play it.
But we have no dating for the epithath of Seikilos for sure
to the 1st cent. As Pöhlmann dates it to the 2nd cent.
But the arrangement is great (truly modern with drums),
but in the second part makes the correct metre, great!
Best musical arrangement I heared of this song for a long time,
also with this pseudo-aulos at the end. Applause! :-) )
F.e. the epitath of Seikilos has a little different rhythm
then most of our interpretations, it just has become a tradition :-) )
Here u might listen to the same metre:
http://www.wat.tv/video/musique-1i6pl_130cm_.html
(sorry for the quality, is not my recording, just of
a nice visitor of one of our concerts)