Go to a free online hosting website for uploading access. A good list of such websites can be found at http://www.makeuseof.com/tag/top-free-file-hosts/
When it loads, scroll through the site's page to find the uploading application. Click "Browse" or "Upload," which should be to the right of the blank form where your file will be displayed.
Find the file location for your music in the pop-up window that opens and displays your computer's file folders.
Click the file, and select the "Open" action at the bottom of the window to transfer the music to the uploader.
Click the "Upload" action at the bottom of the form to generate a URL link.
Drag your mouse over the URL link to highlight it, right-click it, and go to the "Copy" action.
Go to the site where you want to post your music for playback, right-click, and select the "Paste" action to post the URL link so others can access the music and listen.