When you convert a song from a lossless to a lossy format – say, WAV to MP3 – you're throwing away much of its data. MP3 is that small because it lacks the original audio that you cut out.If you convert a lossy MP3 back to a lossless WAV file, you won't get any of the data back. Instead, you will get a FLAC file much larger in size, but the 5Q7OOsm.