Audio
If you have a recording of a song you wrote or performed, or other sound that is not part of a video, you need to upload it to a host: a website that will make your sound file available to anyone online.
One audio host is SoundCloud, which offers a free plan. Sign up for SoundCloud here. Learn about using SoundCloud here.
Another audio host is Audiomack, which also offers a free plan. Sign up for Audiomack here.