The singers may have been real individuals, but it is unlikely that this picture was meant as a group portrait. It was probably one of a series of panels decorating a music room or studiolo. Other panels may have shown different musical instruments. 15th-century artists were interested in painting song, and the expressions of those who sang, such as the angels in Piero della Francesca's 'Nativity'.
The National Gallery, Trafalgar Square, London WC2N 5DN