i have gotten into making playlists on a really specific theme-- the moon, colors, 'yes', 'no', songs about other musicians, flowers, homonyms... making one that actually flows well instead of a bunch of randoms next to each other is the real challenge. you end up thinking about songs you forgot about that you love. whenever i'm out and i hear something that fits one of my themes, i throw it on the list and evaluate where it lands into the sequence later. my dad has been doing this forever with a group of friends, and now i'm carrying the torch (he is still carrying the same torch).