Good Job
I listened to the first couple of seconds of this song when the audio portal loaded up, so I clicked on it out if curiosity, and I must say I wasn't dissapointed. The only constructive critisism I could give is to work on the build-up into 21s. Although it does work as is, I believe that the change of styles is a bit too sudden, and that could be helped by having the notes, played during the roll into 21s, lead into the first note of the change of styles by having the line move up rather than having the line move down then shoot up to the high note out of nowhere. Of course, the words are another factor, so just do what you feel works out in the long run.
Congratulations on making such a good song.