Does it's task
To be honest the first few secounds with the fanfare is the best for an epic vitory after a boss batle, but the whole is more like an end creditts music, with a "what happened after" animation, or maybe I can imagine for a stats hud. Anyway nice job, but a bit heroism could have been there, it's a bit calm for a victory, but it does have the feel.
I give an 8.