Relaxed retrogames from 8bit and 16bit eras

[Tanooki]

Glad to see I'm not alone with Pilotwings as it really is just relaxing once you get the mechanics down on some of the aircraft. Sim City as marlowe said is a given.

[Exhuminator]

I think the defining common thread between PilotWings and SimCity are their wonderful relaxing OSTs. And the common thread there is both OSTs were created by the exceedingly talented Soyo Oka.

http://www.giantbomb.com/soyo-oka/3040-101815/
https://en.wikipedia.org/wiki/Soyo_Oka

[Tanooki]

Good eye (ear) on that. I see the also fairly chill Wario's Woods is also another from this person as well.