NPR conducted a famous "How Well Can You Hear Audio Quality?" test. A significant portion of self-described audiophiles could not reliably distinguish a 128kbps MP3 from a WAV file, let alone 320kbps from FLAC.
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Think of an MP3 like a JPEG image. It looks okay on your phone screen, but if you zoom in, it’s pixelated and messy. The computer "guessed" what parts of the data you didn't need and threw them away to save space. NPR conducted a famous "How Well Can You Hear Audio Quality
: Exhaustive detail on headers, metadata blocks, and subframes. but if you zoom in