Not an auto-playlist by itself, but a playlist mixer.
It's my 'Faves' list and I use it for general play (when I don't have a specific playlist/selection in mind).
All tracks are rated greater than 3.5 stars, have not played in the last 4 weeks and are not seasonal or classical genre.
Then it's 3 tracks from the 1920's, 30's, 40's or 50's decades
3 from 60's, 70's or 80's
3 from 90's, 00's or 10's
all selected at random
then select to play shuffled
gives a broad selection from my library