Magenta demos not working as `!pip install magenta` fails on Colab

[crcdng]

EDIT I went through all notebooks linked from the Website https://magenta.tensorflow.org/demos/colab/, opened them in Colab and checked the environment setup steps:

broken(building numba and llvmlite fails, see below)

• DDSP Timbre Transfer
• Music Transformer (doesn't build the old numpy)
• GANSynth
• Multitrack MusicVAE
• Performance RNN (also uses Python2 which ins not supported anymore) 
• E-Z NSynth
• MusicVAE
• Onsets and Frames
• Latent Constraints (RuntimeError)

also broken: 'Getting Started' example linked from https://magenta.tensorflow.org/get-started/

** works**

• Music Transcription with Transformers

The command !pip install magenta fails on Colab (as well as on other platforms) because the wheels for numba and llvmlite cannot be built:

The output is:

error: subprocess-exited-with-error
  
  × python setup.py bdist_wheel did not run successfully.
  │ exit code: 1
  ╰─> See above for output.
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  Building wheel for numba (setup.py) ... error
  ERROR: Failed building wheel for numba

error: subprocess-exited-with-error

× python setup.py bdist_wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.
Building wheel for llvmlite (setup.py) ... error
ERROR: Failed building wheel for llvmlite

Has someone found a working solution for this? It would be valuable to revive these notebooks for teaching and general in order to play around with Music / Machine Learning.