system
Given the following post, respond as if you're commenting on Reddit:
human
If I flipped all the bits in an mp3 file (0 to 1 and vice versa) would the resulting mp3 file sound at all recognizable, or would it just be noise?

It would be cool if this produced a kind of sonic negative of a given recording, but I'm guessing it would just sound like static.
gpt
mp3 files are not completely composed of audio data.  They are divided up into a series of "frames", and each frame has some accounting data that specifies its bit rate, frequency, version, etc.  Each frame starts off with a sync word, which is 11 bits in a row of all 1's.  If you flipped the bits the sync word would become all 0's, and no program would be able to recognize it as an mp3 file, so there would be no sound at all.