Which electronic instruments created new possibilities for 20th-century musical performance?

In the 20th century, electronic instruments revolutionized musical performance by offering new methods for sound generation, manipulation, and interface design. These innovations allowed musicians to move beyond the fixed acoustic properties of traditional instruments, enabling them to "program" or "patch" sounds from component elements like oscillators, filters, and amplifiers.12

Key instruments that expanded these possibilities include:

• Early Experimental Interfaces: The theremin (1920), ondes martenot (1928), and trautonium introduced novel ways to articulate tone, such as moving hands through space or using specialized fingerboards, which were embraced by prominent composers.1
• Keyboard-Based Innovations: The Hammond organ (1935) became a staple of popular music, while later monophonic instruments like the Solovox allowed performers to augment traditional piano melodies with orchestral timbres.134
• Synthesizers: The development of Buchla and Moog synthesizers in the 1960s provided musicians with versatile tools for both experimental and traditional performance. While Buchla focused on touch-sensitive interfaces, Moog’s integration of conventional keyboards helped bring synthesized sounds into mainstream popular and classical music.2

These advancements fundamentally shifted the performer's role from merely activating a fixed acoustic system to actively configuring the sonic landscape of their performance.2