If you already have your own website hosting your music and you'd like to put others on notice that they can use and share your songs, start by choosing a license for your work.
Choose a license for your audio
On the "Mark your content" page of the license process, copy the code provided by highlighting it with your mouse and hitting ctrl-c (command-c on a Mac).
The specifics of the last step will depend on how you edit your website. Most desktop website tools like Dreamweaver, Frontpage, or GoLive offer a "code view" that lets you see the code that makes up your page. Near the end of the page you are hosting music, before you see </body></html>, paste in the code copied in the previous step by clicking the page and hitting ctrl-v (command-v on a Mac).