I had exactly the opposite experience as Ken :lol:
Done it a couple of ways, my best was when I just spent the $$ and worked with the person who does my trainer’s FS who is across the country. Sent videos. My trainer did the choreography.
The key is having music that flatters but doesn’t overwhelm the horse. Choose that first, then your personal preference comes second.
My old guy is very atypical for a dressage horse, so we picked music that played off of his breed.
My mare is very light and refined, so when we were working on her FS we needed music like that. Bubbly and light, very feminine.
I’m about to start working on the FS for my young horse and he is completely different - not heavy, but not light and feminine. Kind of a hard working guy who is solid. For some reason I’m thinking elvis for him.
You also want music that plays off your strengths. In my case we’ll want to do minimal walk because he goes to sleep, lots of canter and counter canter because he’s good at it, minimal trot lengthenings but play off our ability to do the smaller trot figures. That tells me I don’t want to have trot music with tons of crescendos because it will emphasize the fact that we have crappy trot lengthenings :lol: