The six duos for violin and viola on this recording were composed between July and October 1783. A biographical sketch by Michael Haydn, published in 1808, two years after his death, recounts this in detail. "Michael Haydn was ordered by superiors to write duets for violin and alto. However, he was unable to deliver them by the appointed time because he was struck by a severe illness, which subsequently rendered him incapable of any work for longer than anyone expected; for the great man was incapable of giving a quid pro quo. He was threatened with the withdrawal of his salary if he delayed, because the master was presumably too little informed about Haydn's circumstances, or perhaps even deceived by false reports. Mozart, who visited him daily, learned of this, sat down, and wrote for his afflicted friend with such unceasing restlessness that the duets were completed in a few days and submitted under Michael Haydn's name. We often delighted ourselves later on with this excellently executed work of love, which our master also preserved in the original as a sanctuary, always honoring Mozart's immortal memory. Holy genius of friendship!"