Happens to me all the time. There are often pop songs which are very briefly popular and fade quickly into obscurity. Years later when some radio station happens to play them, you instantly remember what was going on in your life in the era that the song originally came out. It tends to not happen with songs that are extremely popular because they tend to be played for a longer period of time and you just remember the general time and not specific events. It's amazing how vividly a song can bring back memories, though; Freestyle music tends to take me back to my junior high and high school years because that's what I listened to back then.