This page currently is a dumping ground for files you can use to make your project special. It takes some digging to find what you are looking for, but it can be fun just looking around (listening around) for new sounds and clips.
https://www.edmprod.com/the-ultimate-guide-to-remixing/ Read this article about Remixing!
Free Accapellas . https://www.beatlabacademy.com/remix-or-chop-it-free-acapella-vocals/
This website ( https://splice.com/explore/contests ) has a contest that includes free files. You don't need to join the contest to get the files. User name: ahsimp PW: ahsimp2000
Below are some "starter files" you can use. There are many more on the web. Search "free remix stems" or "free remix contest."
bpm - beats per minute
- setting beats per minute in Garageband
- matching bpm with stems found online
Matching Key - Loops, samples, stems
http://beta.ccmixter.org/stems - a place to find stems - sign up is free
https://www.indabamusic.com/opportunities - a place to find stems - sign up is free
https://splice.com/blog/category/tips-tutorials/routines-process/ song writing prompts and examples
https://www.midiworld.com/files/ A great page for FREE MIDI Files