Great thread!
Here are a few songs our duo bring into rotation for summer time:
Soak up the Sun, Cheryl Crow:
https://www.youtube.com/watch?v=KIYiGA_rIls
Shine On Me, Dan Auerbach:
https://www.youtube.com/watch?v=FfVRCDb0G8Q
Michael Franti & Spearhead - The Sound Of Sunshine
https://www.youtube.com/watch?v=KqgHosrqJ8o