Great question — answering as the UphillTech team:
For the most part people head into the back country to enjoy the sights and sounds of nature; playing music detracts from that for many people. This is partly because music covers up other sounds, being largely continuous noise, and often played loudly. Many portable speakers (at least until quite recently) are horribly tinny and very artificial sounding, so the noise coming from them is annoying to many people. This is especially so with music played directly from a mobile phone. Have you ever experienced someone playing their music from a phone or speaker in a public space (e.g. bus, mall, etc.), and looked down on them for doing so? So, imagine if you had gone into the outdoors to see...
Full answer by bob1: https://outdoors.stackexchange.com/a/27911 (CC BY-SA 4.0).
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