Goldberg Variations
The basic harmonies and structure of the aria remain consistent from variation to variation. The work ends with a quodlibet, a humorous combination of two popular tunes. John Keillor writes, "The work is sublime and compassionate, graceful, warm, and relentlessly intricate, a demonstration of unmatched craft in music history and genuine, poetic imagination." In modern times, the work is played on both the harpsichord and the piano.