How to get my music back from google

When i got invite to google music i decided to make good thing- write all tags to my music(some songs was too old and hasn't tag, other tags wasn't in unicode). I made big work(about 2-4k of songs needed editing) and was very glad. Except one little thing- i couldn't got my music with pretty tags back!

I started to investigate how i can do this:

1. Any open api from google, may be because this beta, may be copyright

2. Tried to get something from web-app. Any chance- about 460k obfuscated and compressed javascript. Too much work

3. Beta android music app can download files for offline listening. I'm not very good in android< but that was my chance. And it worked- any real protection.

What i found:

Files contains in sd card at directory /sdcard/Anrdoid/data/com.google.android.music/cache/music

Other players don't see it . Thanks xda developers- there need to delete hidden file with name .nomedia.But files there named with 1,2...3459 and contains old tags. So, music application store that data at other place. I found it at /data/data/com.google.android.music/databases/music.dbThis is simple unsecured SQLite base which contains all data about tracks in 'music' table.So, there wasn't big problem to write simple desktop(due to limited resources at android) application which get DB, directory with android music predownloaded mp3's and sort files by directories and with fulfilled tags.

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