Two songs I heard on the radio when i was maybe about thirteen prompted me to start composing. these were Right Here Waiting (how embarrassing) and the remake of the tears for fears song "mad world."
I heard the piano part for Right Here Waiting, and I realized that the left hand was playing a 5th and a 4th starting on a low note, and though i hadn't studied piano for several years, i decided to sit down and learn how to play the main theme of that song. i figured it out in C Major (i don't actually remember what key the song is really in) and i had a revelation: "i could write something like this."
by playing around, I discovered that the 5th-4th pattern could be moved around and corresponded with different chords.
from that point onward i taught myself (with my school music teacher explaining the technical terms for what i had discovered) the relationships between chords, inversions, basslines, passing tones, etc. (i think my interest was initially driven by the attention i got when people realized that i had written my own music.)
Each time i discover something new, i apply it to my own writing. needless to say, i try to listen to and analyze a huge variety of music. The more I learn, the harder it is for me to find music that i need to figure out