On Multiply, you can not only blog, share photos and videos, but if you've got sound files to share (such as the kids singing Happy Birthday to grandma or maybe your teen's piano recital) you can share that as well.
What kinds of music files can I share? You can upload the following types of music files to your Multiply site: mp3, m4a, wma, wav, aac, ogg, aif and au.
Please be aware that sharing someone else's copyrighted music is illegal and prohibited on Multiply, per our Terms of Service.
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Additional Notes (thanks to lfom):
How to add a music player (Multiply built-in Flash player) to your homepage:1) Go to your main page and click on
Customize My Site (or go to
Settings -> My Site) and click on the
Edit link on your Welcome Message box. You may also use the link bellow:
http://multiply.com/setup/pages/content2) Click on the check box beside
Play music on my homepage and choose a playlist with only MP3 or AAC files. The playlist must be also public (privacy set to 'Everyone'). There is a remind about it if you mouse over the question mark beside the playlist drop-down menu.
3) All set. =) Just know that your music will not autoplay when someone visits your page. (That means it won't just start playing automatically. The visitor has to choose to listen to it.)
Some recent changes about music on Multiply:- the built-in music player in the main page (for those who set i up, obviously) will show up only to Multiply member who are logged in. It means that it won't appear to non-member or when you look at your page as an 'anonymous' user.
- the download links in the Music posts are only visible to the original poster of the music.
So, if you can't see the player when you are not logged in, don't panic, it's not a bug. This may change in the future, but there is no word about when it would. I will update this post if it does.
Important Note on Music: Once you have uploaded music, you cannot delete it. You can delete the post the music was uploaded to, but you cannot delete the music itself. You can even edit the post and select or deselect the musics in the playlist, but you cannot delete them the songs from the selection list (that you see while you're in edit mode).If you have any additional questions about music, please post those questions in the notes section of this group. 
