Room Thirty-Six

...an old and ruinous part of the House. Turning a corner the music we had been hearing became louder and at last we saw the musicians themselves.
They were so involved they failed to hear us. The music was suited to the scene - a moody, romantic melody. We stopped to listen and we admit that we, too, were affected by the sound as well as by the spectacle of the masked players.
One of the visitors noticed us listening. "Beautiful music, don't you think?"
"It's not bad," Penny said stiffly. "The viol brings the right sense of warmth to the piece, but the guitarist is overplaying his part. Still, he adds a certain plangent brio to an otherwise introspective composition..."
Unwilling to interrupt the concert we slipped past the musicians into the door to....

...room 7.
...room 16.