Tenney's piece is for 16 or more instruments. This version for 9 sine waves dispenses with the need for so many parts because the sine waves can be extended to the precise durations required. In a live performance with real instruments, the extra players are required to make sure that at least somebody is playing the note the score requires at the correct time. Live performances therefore have much more timbral variety (e.g. • James Tenney - Critica... ). However, an electronic rendition has the advantage that the pitches can be really precise and create the beating effects that the composer sought. Live performance are also very technically demanding on the musicians. Although the parts are simple, the performers need to be acutely aware of who is playing which note at all times, in order not to risk gaps appearing. This version is also slightly faster than the score, in order to come in under the 15 minute youtube limit.