Well, I was dared to "compose a melody in under 5 minutes," and I did. Then I made it into a full length 7:30 song which you can hear here.
Sort-of-an-edit: Sadly, the song is 8.5 MB at 160KBPS. You're going to have to hear it at 128 KBPS. :C I'll upload it somewhere else in the meantime, so you can hear the higher quality version elsewhere.