Yeah, it is the same, original music or someone else's.
The emphasis is on personal writing (stories, experiences, your inspiration) and not just sharing music, that's the difference between the other music communities and this one. If you accompany your music with the writing part, like what inspired you to write it, how it happened, do you connect it with an idea, a dream, what are your feelings about it or similar, then it is matching the purpose of this community.
For just sharing original music I think it is best to do it in the Music community or Sound Music. 🎶
I hope I could help you a bit with this explanation ;)
Have a great Sunday 😎