The Piano Duet -

Because players must sit side-by-side, their elbows, knees, and hands frequently brush against or even cross over each other.

Widely regarded as the greatest masterpiece of the repertoire , written in the final year of his life and dedicated to a former pupil he loved. The Piano Duet

If you want to hear the pinnacle of this genre, these works are considered essential: Because players must sit side-by-side, their elbows, knees,

Publishers churned out four-hand arrangements of almost every new orchestral or operatic work. These transcriptions often outsold the original full-orchestra scores. Because players must sit side-by-side

This physical proximity was so striking that critics of the era sometimes referred to duet partners as "four-handed monsters," viewing the practice with a mix of fascination and moral suspicion.