Sorry to burst your bubble of hope, but EQ2 has not progressed that far. Our songs are buffs/debuffs and have a short music to them, not enough to really listen to, to ones that pull out a lute or drums are a bit more musical, but still not what you are talking about.
I do like your idea, and might suggest it SoE, and maybe they would implement something similar someday, after we get instruments though.