Also almost forgotten: An audio CD offers high quality lossless audio whereas MP3 is a lossy format meaning that some hear a quality difference with good louds

Also almost forgotten: An audio CD offers high quality lossless audio whereas MP3 is a lossy format meaning that some hear a quality difference with good loudspeakers. The music industry should offer wav/flac audio files (at a slightly higher price) next to MP3 files, if they ever decide to stop producing music CDs!