The melody of Cool Kids by Echosmith runs 387 notes across 63 bars, 4:08 long in Bbm at 125 beats per minute. The tab sits moving up the neck in places, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? Cool Kids chords and lyrics.