No commentary required.  Just page down, and select ‘watch’.  If you appreciate music you will appreciate this genius at work.

On May 4th, 2006, Steve Ball invited Robert Fripp back to the Microsoft campus for a second full day of work on Windows Vista following up on his first visit in the Fall of 2005. This time we get an even deeper glimpse into the creative process as the Windows Product team continued to refine their search for melodies, rhythms, and orchestrations that could become the new Windows Vista startup sound.

Source: Making Windows Vista Sing: Robert Fripp and the Vista Melody