Hehe :3
YES! I do something similar xD I get a bunch of stuff that fits the themes, and then I spend ages just absorbing it, haha. Sometimes I wind up coming out with new scenes entirely inspired by the tracks that otherwise wouldn't have existed! I stick em all on my phone and listen while I'm exercising, which often gives me even more ideas x3 and if I have to go do errands in town and stuff, I listen to em while I'm walking as well, haha. Helps me so much with writing to have something suitable to listen to as well!
I need to check some of the sites out that you mention! Cos I started out on my first game just using incompetech, then wound up getting bits and bobs cheap from DLsite, and kinda stuck with that for ages without exploring much else >.< As much as I love trying to make my own tracks now, I'm just not good enough to cover all the sorts of music I need sometimes. Like the sorta circus-y themed stuff that you've got! I could never make stuff as cool as that x3 not unless I somehow managed to find a loops pack that was circus-themed, haha. And I really suck at making happier, more upbeat tunes >.<” It's like last year with Limbo Line, I did my best to try and make a full soundtrack, but there were moments I couldn't possibly fill, like the theme for Niard, haha. So I kept some of the royalty-free stuff in there to fill in those spots where I faltered x3