Flute Concert with Frederick the Great in Sanssouci, Adolph Menzel
Link is to zoomable version on Google Art Project; downloadable file on Wikimedia Commons; original is in the Alte Nationalgalerie, National Museums in Berlin.
The ostensible subject, Frederick the Great — about whom Menzel painted a series of works — is almost lost among the other spectators, and overshadowed by the the striking presence of the soloist.
The real star of the painting, though, is the resplendent candlelight cascading down from the crystal chandelier — reflected in the ornate mirror and sweeping through the richly textured composition — where it is echoed by the glow of the individual candles amid the ensemble.
A tour-de-force of interior light.