staff:

We now extract album art from uploaded music!

Developers can even add this art to Tumblr themes with:

{block:AlbumArt}
    <img src="{AlbumArtURL}" />
{/block:AlbumArt}

And access Artist, Album, and Track information like this:

{block:Artist}
    Artist: {Artist}
{/block:Artist}

{block:Album}
    Album: {Album}
{/block:Album}

{block:TrackName}
    Track: {TrackName}
{/block:TrackName}