Hi Scott!
That sounded like it was taking me to a magical land! Some interesting passing notes and chords that really added intrigue and made me want to keep listening. The 3:31 was over in no time and I wanted more! Did your son usually fall asleep in 3:30? Like Ron said, those sub-sonics were cool - I reckon I could fall asleep to those low notes. Initially, I thought my audio interface was malfunctioning, but glad it wasn't and glad they came back at the end.
I have to admit that the half-instrument-half-vocal sound was a bit creepy, but maybe it is my adult ears listening that have been conditioned to weird voices at night.
Very interesting - I loved it!
Andrew