Nope. Just in case you are wondering you won’t be able to do that with the Custom CSS upgrade.
You can use the [audio] shortcode to insert a music player in your blog but users will need to manually click play to make the music play. You also cannot import your own music so you would need to either buy the Space Upgrade or simply import your music somewhere else on the internet and link to the audio file. You can make the audio loop though.