Lol, hi, GayTree!
I mostly use royalty free background musics, so yup, you might find those musics used by other game devs~
However, in my 2nd game, Bermuda, I do my best not to use the same musics as Winged Ones and with what little budget I have, I donated to a talented composer(alcaknight) to use her song and I also commissioned someone for a few original BGMs like the one I used for the trailer so look forward to it! ^.^