I thought I would draw one of the Angels that he described by thinking about the description and guessing.
I think the Angel would be twice the hight of a man and have a head with four faces. I think the reason the being has four faces is because it gives the Angel outstanding musical ability. The Angel also has hoofed feet.The Angel can sing amazing songs. It can also exist as a wheel nested inside a wheel, the rims are covered in eyes. It exists as both a nested wheel and giant winged creature with four faces at the same time and moves between forms so quickly that they are both visible together.
I think the Angel had scales made of gem stones all over it's skin so it looks like a reptile but with shiny skin. Perhaps he was from the Planet "Earth Wind and Fire", my jokes are so dry.