"an early Flemish primitive of Saint Cecilia at her celestial organ"

 Saint Cecilia is a martyred Saint who is reported to have lived in the 2nd Century AD.  The most popular account of her life holds that she was killed in Sicily during the reign of Marcus Aurelius; she is meant to have been executed for her Christian faith alongside her husband Valerian, and his brother Tiburtius.  Famous elements of her story include her instructions that her home be kept as a church, as she left to go and face her death.  Attempts by officials to execute Cecilia all subsequently failed; they attempted to decapitate her three times.  She was severely wounded, and survived for another three days before passing away.  She was said to have died singing praises to God, which is why she was later made the patron saint of musicians.  Henry Purcell composed a beautiful tribute to her in 1697, in honour of her feast day on November 22ndHere is a version of it, along with some images of Cecilia; she has been a popular muse for centuries. 

Flemish Primitives were the paintings completed by artists of the then-called Low Countries (the Netherlands, Belgium, Luxembourg, and parts of Germany and France) between the 15th and 16th Centuries.  Influences from both the passing Medieval period and the burgeoning Renaissance can be seen in most of the works.