Microsoft Arc Keyboard ... Plays the Piano?

Whenever I turn on my Arc Keyboard using the FN + Esc key combinations, the keyboard makes a long, sustained, high-pitch sound, and then plays a very rapid sequence of notes.

Does anyone else notice the same thing about their Microsoft Arc Keyboard?

Hay!
My Arc started today to do exactly as you descrive the same sound
starts with a scale, then sustained sound and then the inverse scale
I had never heard before and I am lookin for some answer in internet but can´t find anything...