The first song is lost in the sands of time somewhere (which is probably for the best).
I do have, however, the first MIDI composition of mine, produced when I was 14 years old for a rubbish little Final Fantasy type game me and my friend failed to complete. It is absolutely dreadful.
If anyone has any recommendations on where I could post this atrocity, I would gladly let you giggle at it... embedding MIDI files doesn't seem to be much of a thing these days though.