How do I write theme music?

ego!

Just mess around with stuff till you hear something good.

@XOIIO Yeah, I know it is strange for someone to write theme music for themself. But I am bored and want to compose something, and hopefully it will end up being more than just theme music.

Just like poetry, music uses specific stylistic devices to convey emotions, pictures or thoughts. We had that explained to us in music classes back in school by looking at certain pieces of classical music. You should search for literature on that.

What software are you using? There’s a lot of options out there, some programs allow you to take loops (pre-recorded motifs) and manipulate them. I use Logic Pro for Mac, but there are a plethora of similar programs for windows.

Do you have a musical background? If not, a good study of musical genres would do you good. You could search on an open-source site like moodle.com for some courses on scoring.

go to college and get a doctorates degree in music. youll touch so many styles its ridiculous. and be forced to perform and create stuff anyways in a complex manner.

Talent (and enough buckazoids to buy a good synth and a sequencer, and maybe a vocoder if you can’t sing well)...

@PhiNotPi If you want to re-create anything remotely similar to the Imperial March. You have to train your butt off as a conductor. Edgar Elgar, John Williams weren’t born, and music popped out of their head like Mozart (yea yea i know his father trained him early on). They extensively were obsessed and studying like maniacs.

Perhaps I have underestimated the difficulty of writing music.

@PhiNotPi Just remember, it’s one thing to wonder about doing something. It’s another thing to live it as your lifestyle.

Before starting on an orchestra piece, I recommend you start off just by writing melodies, and then trying fully harmonized piano pieces, from then progressing to string quartets, wind pieces, other ensembles and finally orchestra music. It will keep you busy for a while :)
(at least that’s how I learned composing)