Let’s use my own childhood as an example. I heard a few too many nursery rhymes from my crib, like “Mary Had a Little Lamb” and “Merrily We Roll Along.” Songs that focus on the 1st, 2nd, and 3rd scale degrees, small intervalic jumps, feel more familiar, more comfortable, and more nostalgic, to me at least.
“I Like It”: The intro here begins with a two-bar fade-in of non-loop material — yet even with these two bars, they still decide to keep the whole intro to a tidy eight bars. There’s a nice little post-verse thingy after the second verse. You can spot it by its chromatic walk-down piano motif, four quarter notes a step.