White and polychrome marble singers gallery, with bronze and vitreous paste inserts, carved by Donatello for the Cathedral between 1433 and 1438. Embellished by a frieze depicting dancing angels and by two bronze heads sculpted by the artist and possibly by Michelozzo Michelozzi. Donatello’s choir loft, like that of Luca della Robbia, on display nearby, was attached to the crossing piers of the Cathedral, above the high altar. It was sited on the south-east wall, above the Canons Sacristy, and housed the organ, and during services, the choristers. The parapet is decorated with a continuous frieze, occasionally interrupted by pairs of columns, which depicts "putti", or angels, in the guise of children. They are performing a fast, whirling dance and holding hands. It is a singularly joyful frolic, its dynamic rhythm emphasized by the glinting mosaic of its background, rendering luminous and vibrant the angels’ spiritual exaltation as they hymn God’s glory: a joy shared by the whole Church during the celebration of Mass. Donatello also sculpted two busts of vigorous elders on the mensulae supporting the choir loft. They may have been intended as prophets, or were possibly an allusion to the world of classical antiquity which so fascinated the Quattrocento.