This activity was a big hit with my students! I did it with my 3rd and 4th graders and also my middle school choir. We were studying John Williams for our monthly composer. I would play a snippet of each movie theme. I'd say, for example, "Here is number one", and I'd pick a song at random to play. They'd have to try to figure out which movie the song went with and then write that number next to the picture. This is great for assessment or even test preparation over the composer to get them to be able to identify songs.