21.   Clicking on each syllable produces its sound.

22.   Could Hvorostovsky dance and lift this way while actually producing sound?

23.   Different combinations of wood produce different sounds.

24.   Even home computer systems can produce great sounds if they are linked to high-quality amplifiers and speakers.

25.   Intonation occasionally went astray, yet in their best moments, the players produced a sound of great beauty.

26.   It is a thermodynamic organ that uses a glass flame in a Pyrex tube to produce sound.

27.   It will, they add, produce natural sounds, not cheap electronic imitations.

28.   It occurred to the scientists that fine particles of silica gel alone, which is used commercially as a drying agent, might produce sounds.

29.   Most pianists will include at least one flashy piece to show their ability to produce loud sounds and play very fast.

30.   One of the works on display, by Douglas Irving Repetto, lowers robotic arms to a rock-covered turntable to produce sounds.