Hah! That's a rarity, I'm usually on the receiving end of region restrictions, at least they were still straight forward to find. I had no idea what Hee Haw is, but yes it did make me think of one half of the two kinds of music that exist (country & western, of course).
Scratching the surface yes, we're not even including music such as that uploaded by AnimeVibe - I'm pretty sure that's just clips of anime synced to music that they consider to match...still because I randomly stumbled upon it I've picked up the names of some anime that I wouldn't have known of otherwise (Such as this Bojet song set to Kimi no ka wa).
But back to actual tunes involved in an Anime, one can't forget the other end of the spectrum from relaxing anime OP - Rumba, rumba, rumba, rumba... - Goku Sayonara Zetsubou Sensei - Third opening. In no way relaxing! I still like it though, shame they didn't adapt the ending of the manga into anime...yet.