The little ditty, is Money Money Money by Abba. I wish less time was spent wasting time on an easter egg, and more on the development and testing. I had no end of trouble with the TRX, water ingress, around the on off switch, foam insert in battery cap failing and not pushing against the battery, sounding off when nowhere near ground especially if you rotated it towards the sky.
All were known issues, I had 4 TRX's in the end White's UK replacing them. I went back to my old garrett pinpointer