If you’re an audiophile, you probably prefer downloading music that’s “lossless”, meaning no audio data has been dropped to reduce file sizes.
If you’re not, you probably use the ubiquitous MP3 format, which manages to to an excellent job at squashing audio files down to size, but is “lossy” — it removes data from the source.
Trusted Reviews tested to see if people could really tell the difference, and the result will surprise some.
[via /., who warns of many ads and such on this page]