You can actually use thousands of oscillators, which is what Magenta did with their differentiable DSP (DDSP) approach to modeling acoustic instruments includin

You can actually use thousands of oscillators, which is what Magenta did with their differentiable DSP (DDSP) approach to modeling acoustic instruments including singing: https://magenta.tensorflow.org/ddsp-vst https://magenta.tensorflow.org/ddsp-vst https://magenta.tensorflow.org/ddsp https://magenta.tensorflow.org/ddsp I doesn't sound realistic but it is expressive in an unusual way.