The Exposure Effect

Implicit memory is a form of classical conditioning.

An event, an emotion, and a song get connected through implicit memory.

When a piece of music is paired with a very emotional event, it can be an effective cue to bring back the strong emotion that was felt at that moment.

Also, we may even develop a preference for certain music pieces simply because they have been repeatedly played in the background.

This psychological phenomenon is known as the mere exposure effect. People tend to like best what is most familiar.