Roblox song ID finder player gui script help?

So recently I come around a roblox ID finder. I wanted to know how you make one yourself? Could anyone give me the basics of it?

I believe it uses HTTP to run the thing.

You need to use proxies, as you cannot make HTTP calls to ROBLOX itself. A proxy I use is https://rprxy.xyz/. For what I use to search, I do

game.HttpService:GetAsync('https://rprxy.xyz/proxy/api/searchmusic/'..string.gsub('mySong' --[[insert song here]], ' ', '%20'))

Hope this helps!