first, answer the first question: there is basically no difference between lossless music and genuine CD in listening sense, but the difference lies in the difference of media (CD has collectible value) and the ownership of copyright. Genuine CDs are directly protected by law and are not allowed to be rented, while lossless music is not allowed to be enjoyed in principle, but at present, its * * * enjoyment rate is still very large, and with the blank of national laws, everyone acquiesces in its * * * enjoyment. Then there is the second question: lossless music is mostly captured from CDs with related software, and the three formats you mentioned are all optional, among which WAV is the most direct capture, without any compression, and the sound quality is no different from that of CDs, so it is not allowed to be written into labels (that is, the information of artists, albums and so on displayed when playing); APE is second, but you can write labels, but this label protocol is not very common. For example, some MP3 players don't recognize APE labels. FLAC has the largest compression ratio, but it is used the most and has the most mature technology.