Yes this song uses classical instruments but...I think its a simple theme that I build using repetition into the other theme sections with different variations and rhythm contrast in each theme. All songs use simple chord progressions. This song has simple repetition in the melody which makes the composition easy to remember. To me melody is the most important thing in music and when I am composing I focuse on a melody. There's no rules to what chord progressions you can use. Many different types of classical musical have used all the sub dominate chords and classical has used the I - vi - IV - V before modern pop music even existed. Don't be Critising other musicians Nirvana69 over me claiming its classical. I thought as a composition its like classical but technically not. The melody is the most important part of this composition. As I said this song is a song I wrote when i started to learn to compose.
"Another common way of extending this sequence is by means of the chord of the sixth scale degree, giving the sequence I - vi - IV - V or I - vi - ii - V. Sometimes called the 50s progression, this sequence has been in use from the earliest days of classical music: after generating popular hits such as" Wikipedia
"http://en.wikipedia.org/wiki/Chord_progression"