It must be lossless. Because the song lossless format music, under normal circumstances the sound quality is relatively good in all aspects, but in my cool music if you want to listen to lossless format songs, it is necessary to fill the member, and the unlocked version does not need to fill, members can also listen, but the sound quality will be greatly discounted, if you do not pay attention to the sound quality, the unlocked version is also OK.