I followed the developments at WWDC 2011 with interest, and almost at the time of the Apple iCloud announcement, I received a letter like this:

What an interesting coincidence :)
')
I sent the request for an invite almost immediately after the announcement of Google Music through an American proxy, because I didn’t let it go from the Russian ip-addresses. But now I got to the
service without any problems.
At first, the service suggests adding “free” songs, but I missed this step and decided to go directly to adding tracks from my computer.
To do this, you need to download a certain "Music Manager".
Pleased with the Mac version.
It was not possible to check on Windows - the mini-installer downloaded, but during the installation, “download failed” cursed, and that was all. Retry results did not give.
After installation is a simple setting, and the music begins to pour into the cloud.

More than 20,000 songs, as promised, do not flood:

After this, the Music Manager window disappears, only an icon appears in the menu bar, after clicking on which the system settings are started and the prefpane is loaded, where we observe the process of filling the songs:

It is noteworthy that I did not find any buttons like “Stop downloading”. You can stop only by turning off the application.
A poured slowly. Damn slow.
Apple, by the way, just warned about this :)

But back to the topic:

This is how the interface looks like if you turn on a song (double click).
Loaded music too slowly. Apparently, not one I now got an invite:

The service can edit song information - useful:

Creation of playlists, drag & drop and so on works.
In general, it works. However, it’s just like a music player - not very much, the same simple player or last.fm seems to me much more convenient.
Unfortunately, I don’t have an android device at hand now, and I can’t verify the synchronization feature :) I will try to do it as soon as possible and update the post.