What Dreams Are Made Of by Hilary Duff.
This doesn't exactly have a memory attached to it, but it was my favorite song in the third grade. It does remind me of the time I went to the movies with my mom and my sister to watch the Lizzie McGuire Movie. I suppose if I listened to other songs I could name one that had a specific memory attached to it. Wait, I just thought of one.
This one reminds of the time when a former friend and I used to be close, before things went bad. We were each other's confidantes until things got so screwed up that he blocked me on any sort of outlet I could contact him on. We did discuss the song once, but it reflects how much I... uh, put my trust in him. Not something I particularly like to admit, but it's true. OH AND THERE'S MORE!
Marching On by OneRepublic
The reason I found this song was because it was attached to a video about Harry Potter, and my other friend and I fell in love with it. We couldn't stop talking about it for a week. We were studying for finals (or a test or something) and we played this one. I also have a Pandora station around it, but there's really nothing quite like the song itself.