why do a lot of old music videos on youtube sound remixed and not the original

songs from the 60s 70s and 80s, many of them sound remixed on youtube now and not the original versions...why is this?

not all music, there are still some original versions up of old music, but many have been remixed it sounds like.

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ElwoodBlues · M Best Comment

Part of it is probably due to digital data compression, which is a lossy process. For example, MP3 compression throws away sounds that are imperceptible or almost imperceptible, and sometimes you hear a sort of "crackle" due to it.

Another part may be that soft passages of the music are often made louder because that "sounds better" to modern ears (especially in a car or other place with background noise). It's called dynamic range compression, and no remix is needed; it can be done on the fly as part of the streaming. I don't know how often dynamic range compression is applied to a stream, but that could explain what you're hearing.