Hi Michael!
I have an idea (I don’t know if it can be done with a plugin). I haven’t found a plugin to manage custom music charts, or a simply way to present/embed/… a custom link (with a shortcode?)to a song from, for example, iTunes, 7 digital, last.fm… If that plugin can get the song info (cover, title, album, author) can be the best for music bloggers!
Great initiative! Cheers!