Bandcamp, every month. It's the only marketing mailing-list I voluntarily joined.
Soma.FM has done right by me for years; it's what plays every day on my music-playing appliance in the kitchen. It's streams, but not proprietary crap like Spotify where I have to spend a third or half of the time trying to get their software to work correctly.
Shoutcast/Icecast streams are great because they're free, it's a well-known format that works with anything not solely some gatekeeping software, and the stream includes whats-playing-now so when you hear something you like you can find who made it and search for more.
incompetech by Kevin Macleod, for when I was desperate for music to make intermissions for Monday nights.