For the title, see Titles.
Emperor is a music track that is unlocked during the Dragon Slayer quest.
Analysis
The song is very slow and simple. It has some low strings and a choir in the background, and what sounds like a trumpet or coronet.
When the track arrives at the bridge, the instrumentation changes dramatically, with a guitar playing waltz triplets, violins playing a counter-melody, and woodwinds having a melody. It briefly goes back to the beginning melody, but quickly switches to an almost operatic strings and choir part, with a piano playing the melody.
The trumpet joins back in, and plays the ending melody, before fading out to the sound of the piano.