An angel/music cipher that points out 3 notes of the music
 to The Rosslyn Motet accounting for 70% of the entire cube sequence.

It is so subtle a decoy that you are supposed to think
it is a musician playing a Harp or Psaltery,
but when you look in detail, he is actually pointing strategically
 at 3 different lines and spaces of a stave of music.

Referring to the first 3 cubes rising above his head.