Simon and Garfunkel are nice in classic rock wise

I don't really know of any relaxing techno because when I think techno I think energy, or at least all of the hours of techno I have are energy

Artists you might wanna look into
(going down the list of my "chill" playlist and picking random more popular names out):
â?˘Jamie Cullum (Jazz Rock)
â?˘Praful (Jazz techno)
â?˘Quincy Jones (R&B)
â?˘Herbie Hancock (Jazz R&B)
â?˘Stevie Wonder (Jazz R&B)
â?˘Chris Botti (Jazz Electronic)
â?˘Lemon Jelly (Electonic Techno)

Specific songs that are more chill than others in my club mix:
â?˘Together - Joonas Hahmo
â?˘Break My Fall - Tiesto
â?˘Stars - Erika Jayne
â?˘Why? - FKN (Everyone knows this one)
â?˘The Longest Road - Morgan Page
â?˘Girlfriend - Robbie Rivera
â?˘Back To Zero - Robbie Rivera
â?˘Blue - Eiffel 65 (Just funny...)
â?˘Don't Belong - Andy Duguid
â?˘Round & Round - Mischa Daniels
â?˘Sex In Space - Mofus
â?˘Love Like This (Johnny viscious Radio Mix) - Natasha Bedingford *My favorite mix*
â?˘Real Life - Aurora

This one's not really chill I just like it
â?˘The World Is Mine (F*** Me I'm Famous Remix) - David Guetta

Hope This helps, my big sides are jazz and electronic...let me know if you want to know of any other people, rock isn't really my thing