ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

python: 3.7.7
bokeh: 2.2.1
jupyter_core: 4.5.0
jupyter_client: 5.3.3
Chrome 85
macOS Catalina 10.15.7

Description of expected behavior and the observed behavior

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Most items coming from questions on the community forum

• a proper multicategory bar example based on https://community.plotly.com/t/multicategory-axis-type-example/26392
• example of shape or annotation covering several subplots thanks to xref='paper'. Also the shapes and annotations tutorial should link to each other.
• orthographic projection example in 3d axes tutorial (or

Make the animation smoother.

Hello,
Considering your amazing efficiency on pandas, numpy, and more, it would seem to make sense for your module to work with even bigger data, such as Audio (for example .mp3 and .wav). This is something that would help a lot considering the nature audio (ie. where one of the lowest and most common sampling rates is still 44,100 samples/sec). For a use case, I would consider vaex.open('Hu