As a trained vocalist for many many years, it is often surprising to me how a vista, or a person, or a situation can just immediately spark a musical memory! There are people in my life that I cannot think of without associating a song with them. Some more so than others.
It's that musical memory...
"The long and winding road, that leads to your door..."
Some people are just songs in our lives! You hear the song, and you cry over the person! Or you hear the song, and you call that person! Or you hear the song, and you just can't stop the memories from flowing!