So, I have NOT used this particular product or website, but for example:
Led rope light with beat-synching, color changing, cuttable to length, includes tape and brackets for mounting.
If this doesn't work for you, try searching for "music-synced led rope lights" or similar.
Probably, similar products available at hardware stores such as Menards, or if you are okay using scamazon, they'd have something similar too. Not sure what the anagolous local companies would be in Japan, but look at hardware and/or lighting stores and they should be able to help you.
Well within budget, will move to the music, can adjust speeds/colors, cut to length, mountable, reusuable.
Just make sure you're getting a complete kit, getting individual items in led rope lighting is more fiddly and confusing than a complete kit.
Best of luck!!
“You must have chaos within you to give birth to a dancing star.”
― Friedrich Nietzsche