The left hand panel's frame is inscribed with the words ("Music in Praise of God"), the frame of to the right with ("Praise him with stringed instruments and organs"). A number of art historians have defined the figures as angels based on their positioning and role within the overall context of the registers. They are sexless and possess cherub faces, which contrast with the realistic depictions of the other full-sized non-divine females in the work; Eve in the same register and Lysbette Borluut in the outer panels. The angels are dressed in elaborately brocaded ecclesiastical copes or chasubles, mostly painted in reds and greens. Their robes indicate that they are intended as representative of the celebration of mass before the altar in the lower central panel.