Let’s start with relatively mild moods. Of Monsters and Men have a few songs with nice buildups. Dirty Paws for instance.
Midlake’s Young Bride might also be worth mentioning.
Probably unexpected, but she is definitely crazy (in the best possible way): Aurora - All Is Soft Inside
Also her direct relative (musically), Bel Canto - In Zenith
On to rock now, three songs with incredible buildups I cannot help but recommend:
Thunder Road, covered by Tortoise and Bonnie ‘Prince’ Billy
I’m sure there are people here with more experience that will be glad helping you comprehend what is and what can be done before you come up preposterously “establishing guidelines”.