This is a great discussion point - and one that I think the world of composition needs.
There is no secret that I am a tonal composer. It's just the music I enjoy writing and listening to.
As a composer, whichever combination of tones you use will create something that is unique to you, whether is be 5, 7, 8, or 12. Provided you are not copying a piece directly, then it is original enough. The biggest problem comes from exposure. Why would a (paying) audience go to see a symphony by an unknown composer which sounded Classical, rather than their favourite Mozart one. Here lies the problem with originality - performances.
Bottom line, if you want to write tonally, do it. It's still original. However atonal music is more likely to be performed, which brings me to the next point.
I, as a composer, want to write music that I enjoy. If someone tells you what style of music you should write, then that will ruin the enjoyment of music for you. This is the problem with conservatoires, who tend to only accept people with an avant-garde style which they consider to be more original. Not to attack John Cage, but silence? Seriously!? Disclaimer: I mean no disrespect to atonal/avant-garde composers. You are all equally skilled and creative. I just personally don't like the style.
If even one other person besides me listens to my music and enjoys it, then I feel like I have succeeded in a way. I would like to get my music performed but composition isn't my main pursuit in music so I don't mind as much. New music ensembles tend to only want to perform avant-garde pieces, and traditional orchestras generally do not accept pieces from budding composers.
As a composer, I want to reach out to other musicians and show them what I have worked on. You could say I am trying to "revolutionise music" because I want to show the world that tonal composers still flourish, even though they are looked down on by competitions and festivals.
I thought about this a few months ago. I love the works of the greats from the last few centuries. It appeals strongly to me, because my ear - as most ears do - perceives it as right. Tonal music is designed to be pleasant - but that doesn't mean it is limited to what most non musicians think classical music is.
Take two birds sitting on a branch. One sings tonally, the other races rats over a finish line and sings the notes in the order that they place. Which one will get a mate? The ear - our ear, an ant's ear, a bird's ear - likes the harmonic relationship between the frequencies of a tonal scale.
My style, as I have said before, is tonal, but I like to experiment with the changing harmonies caused by a chromatic movement.
Listen to this simply beautiful piece by Grieg. I didn't play it for a while, because from looking at the score I could see it had a lot of chromaticism. But it is still tonal, and this is what I try to write. I don't count myself as a pastiche of Grieg, because I draw my style from another source.
Scotland has a rich traditional music heritage, and if you listen carefully to some of my most recent music (not posted here yet) you can hear the influences from playing fiddle in a school folk band. I even write specific Scottish traditional pieces to play in the group, although that is not the main part of my output.
My style?
Tonal×Accidentals×Scottish Music
Music is so subjective.
Thanks for sticking with me, it's my longest post ever.