Most often, those that we did not listen to.
And short ones.
Most of all chances are those that we like.
And we like those songs that have familiar elements
(up to the border with plagiarism).
By the way, this is exactly the trap that modern show business has fallen into. listeners; (
Such melodies appear in our heads involuntarily, so it is not yet possible to study in detail what exactly is happening in the brain at this moment.
The most intrusive melodies activate not only our auditory cortex, but also part of the motor cortex associated with movements. An important role of rhythm is to make a person move. Obsessive melodies make us move stronger than others, so it's harder to get them out of my head.
The average length of a passage in the head is 15-30 seconds. The melody should not be too difficult and contain a lot of repetitions, the voice should be masculine, but high.
Based on these characteristics, one of the most intrusive songs is We are the Champions by Queen.