The following was taken from an account of a sitter being painted by John Singer Sargent in 1902:
My husband came several times to the sittings. On one occasion Mr. Sargent sent for him specially. He rode across the Park to Tite Street. He found Mr. Sargent in a depressed mood. The opals baffled him. He said he couldn't paint them. They had been a nightmare to him, he declared, throughout the painting of the portrait. That morning he was certainly in despair.
Presently he said to my husband: "Let's play a Fauré duet." They played, Mr. Sargent thumping out the bass with strong, stumpy fingers. At the conclusion Mr. Sargent jumped up briskly, went back to the portrait and with a few quick strokes, dabbed in the opals. He called to my husband to come and look: "I've done the damned thing," he laughed under his breath.
What appeared to interest him more than anything else when I arrived was to know what music I had brought with me. To turn from color to sound evidently refreshed him, and presumably the one art stimulated the other in his brain.
References: I found the information in this post from the accounts of Sargent's process and methods by some of his students, Miss Heyneman and Mr. Henry Haley. A collected PDF of these compiled notes can be found on Craig Mullins' site here.
