DJ Cam Quartet's Rebirth of Cool is my ambiance secret weapon. At my previous job I sometimes had to do technical setups for receptions and such and if the person asking for the setup didn't ask for anything specific I would always default to that (and the other two DJ Cam Quartet albums from that time, Diggin' or Stay). I often had great feedback on it, it's really a masterclass in its genre; content to have or not your full attention, it's not too rich that it's distracting, but it doesn't feel empty like background music often does either (easy-listening, smooth jazz, chill-out, lo-fi hiphop).
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The latest Atari 50 DLC is a bit insane too. With a couple of exceptions, it's home ports of Namco games, not arcade. And the Atari port of Pac-Man is infamous. The real DLC they need is Activision, and then maybe EA, dunno why they can't make a deal for this.