Ex.1
Trevor Wishart Vox 5 (1986)

Ex.2
Alvin Lucier Silver Streetcar for the Orchestra (1988)
In Silver Streetcar, the player dampens the triangle with the thumb and forefinger of one hand while tapping the instrument with the other. The performance consists of moving the geographical locations of these two activities and changing the pressure of the fingers on the triangles as well as the speed and loudness of the tapping. During the course of the performance, the acoustic characteristics of the folded metal bar are revealed.