This code needs a bit more polishing. It lets you install a plugin into cliforce that can pull data from freebase and import into the Music Library Sample App so you have some data to play with.
The following should work:
$ git clone git://github.com/jesperfj/musiclib-dataimporter.git
[...]
$ cd musiclib-dataimporter
$ mvn install -DupdateReleaseInfo
$ cliforce plugin sampledata
$ cliforce sampledata:getmusic
$ cliforce sampledata:import