To host your own audio:
Upload audio to a host, such as dropbox, then paste the direct MP3 URL(s) here.

To host audio from YouTube (without downloading):
Copy the link and paste it to a host, such as ytmp3. Press convert, right-click "copy link address" from the download button, and paste the URL(s) here.

There are six audio slots here, but you can add as many tracks as you want in the code. Titles are not necessary.