A melody enters through the ears.
Hours later it is still playing internally.
You hum it.
Somebody else hears it.
Now it may inhabit another mind.
An earworm is almost a cartoonishly clear memetic lifecycle.
nursery rhymes
football chants
advertising jingles
melodies with changing lyrics
TikTok audio fragments detached from their original context
The carrier can change while the recognizable pattern survives.