Here's the music that plays while in the National Park. Enjoy!
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Here's the music that plays while in Ecruteak City as well as Cianwood City. This is one of my favorites.
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Here's the music that plays while in Azalea Town. It's also the music of Blackthorn City. Good times.
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I guess the best way to describe it is peaceful, almost a lazy, laid back feeling with a twinge of nostalgia. Gen 1's music is a lot more like you're going on an adventure, and gen 3 is VERY adventurous, whereas Gen 2 feels just... mellow.
Gen 1 was an adventure
Gen 2 was vibes
Gen 3 was a grand adventure
Gen 4 was vibes, Sinnoh was pretty cozy until the worst designed dungeons hit
Gen 5 was a mix of both, the main game was adventure but post game was 100% vibes
Gen 6 was... idk actually
Gen 7 was vibes but Hawaiian
Gen 8 was mostly tracks to amp you up, like a stadium
Gen 9 was just whimsical adventure until you hit the endgame where it suddenly becomes X-Files