Diego

SomaFM and Radio Paradise (already mentioned) are great picks, both listener-supported and basically ad-free. If part of it is the being-alone feeling and not only the music, one more option: I made a small site, coquiet.app. It plays calm ambient music with no ads or talking, and shows how many other people are in the same “room” right now. No account, no chat, nothing to manage. Disclosure: it’s my project. It won’t replace a good radio host, but some people like the quiet company.