I found this song in 2009 and haven't stopped listening to it since. The different styles that go into this song are perfectly interwoven. You get the Power Metal guitar and synth, the creativity of lyrics and harmony of Progressive Metal, and the intense growls of (melodic) Death Metal all woven together to form a masterpiece. I'd definitely recommend listening to Serenity if you like any of those three genres.
Song: Oceans of Ruby
Album: Fallen Sanctuary
Genre: Power Metal, Progressive Metal
Thoughts: The gradual fade-in and quick change to powerful guitar/synth combo as a lead in to the main chorus is a common melodic/power/progressive metal style and I love it. There is so much you can do with it and still keep the sound fresh. Some intros/outros get stale rather fast, as (most) every band that uses those particular styles seem to use them in the exact same way and offer little-to-no variation in how they're used - down to the same timing, beat patterns, and overlapping end vocals.