Hello! Had the Game of Thrones theme stuck in my head, and kept varying it while humming it, so thought I'd try to come up with a more complete piece based on some of those variations! Would love any constructive criticism, or just any feedback in general :)
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Hey, hope I can help! Music composition and theory background -
It is great that you can come up with melodies - that is one of the hardest battles. To be quite honest with you, there is proper ways of doing voice leading in tonal (and atonal) harmony, but really no one cares if it is "proper" anymore outside of some collegiate settings. Basically, if it sounds good to you, chances are it will sound good to others (tonally speaking - atonality is not liked so much here in the west).
The textbook I used in school was called "Tonal Harmony". It was a good textbook, but I didn't think it was worth it outside of learning the basics. What has really helped me as a composer has been learning to play and improvise on the piano. Even musicians like myself with little piano training should be able to go up to a piano and "bang" out notes and add simple left hand chords to them. Piano music (and choral scores) are all about voice leading - it is what makes the instrument (and voices) sound good.
Next time you have a chance, play a melody on the piano. Try and identity what chord sections of your melody use and try that. Keep in mind that just because your melody has "C E G" in it does not necessary mean you have to use a C major chord. Try an A Major (there will be dissonance with the c/c#), an A minor 7 (A C E G), etc. Let me know if you have any questions. =)