Songs that modulate is all I can think of to search. For a great example, though you specified country, here's a song that changes key 22 times as covered by a bunch of Staten Island people who collectively call themselves The Band Geeks. It's a Sergio Mendez classic called Never Gonna Let You Go. And while you are watching, listening for the key changes, and laughing because they present it in a humorous way, play close attention to how frickin' good these people are. The guy playing guitar and singing is from Blue Oyster Cult.

https://www.youtube.com/watch?v=1nhIRJkj8SE&ab_channel=RichieCastellano