Asset Store : https://www.assetstore.unity3d.com/#!/content/107732
It is an original music material collection. It is collected as short as possible a seamless loop music, or repeatedly composed music. Even those that are not seamless loops, loop playback is possible.
In order to be able to use it for smartphone applications, I put in some versions of the file size reduced by adjusting the song length and bit rate (There are only one type).
All 31 songs.
Also there is a simple demo player, please build and enjoy playing!