I don't have one.
All of their favorites change often. It's usually based on whatever's newest to them.
Really though, any of those songs on those playlists would work for them.
What's the saddest your tulpa has ever been and why? ;-;
Apollo: 16-week-old tulpa. Fiery, sunny, happy, loving, childlike, playful.
Piano: merged tulpa, 6 years old. Reserved, stolid, reluctant, haunted, protective.
Luxi: newest tulpa. Electric, confident, care-free.