Linked from
The 21 pages that link to Electronic oscillator, each with the reason it gives.
SynthesizerRelated: Its waveform supplies the raw tone that a synthesizer shapes.
Radio transmitterRelated: It supplies the carrier frequency that the transmitter will modulate.
WaveformRelated: Oscillators generate recurring waveform patterns.
Electric organRelated: Oscillators generate pitches in many organs that do not use tonewheels.