Grab your phone, make sure you're not signed into your Google account in the browser, and head to music.google.com. You'll see the above, with a big fat (non-working) link to the Android Market's music page (https://market.android.com/music). It doesn't take much imagination to see how this relates to the rumors that Google is planning to open its own music store, and have it tied into your current Google Music Beta account.
It's widely believed that Google Music was supposed to launch with such a service, but content deals couldn't be made and those plans were scrapped -- leaving a free storage locker for 20,000 of your own songs you can stream anywhere. The addition of an Amazon-esque music store, tied directly to your existing Google checkout account, sounds like a winner to us. Keep it DRM free, allow me to easily download purchased content to my phone or computer, and you have a customer for life, Google.