This thread knocked loose something in my brain. I used to listen to a local band called Percy Hill in high school. I'm not much of a jam band guy, but I loved the shit out of their CD, Color in Bloom. I was looking for a particular song that I remember as being particularly great, called Sun Machine. It wasn't until yesterday that I could remember the name of the band though! Cut to today, I've been scouring the internet for a copy of that CD and so far I've discovered that they've broken up and that their CDs are no longer pressed. Amazon has one or two new copies listed at around $53. Fuck that. I may get a used copy if I can find a good seller. Unfortunately, YouTube does not have the song I was looking for, but they do have one of the other tracks I particularly like from that CD, called 313. If that's not "sunny day" music, then I don't know what is.