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[Vincent Kars]

Using an expression column I tried:
GroupCount([Bitrate]) - GroupSummary([Bitrate])

It doesn't work.
I inserted Bitrate using the Insert Field tool.

GroupCount(Bitrate) - GroupSummary(Bitrate)

It works as soon as one removes the [ and ]

Is this done on purpose?
I do think it a bit confusing if there are functions requiring [] and some that don't.

[6233638]

I agree, this is confusing. I thought fields were always supposed to be enclosed in square brackets?
 
I'm also seeing a huge reduction in performance when using GroupCount(Album) in a view with about 500 albums for example. Scrolling becomes very slow/unresponsive.

[Matt]

Is this done on purpose?

Yes.

That's how it works.

You want to put the field name and not the field value into the GroupCount(...) / GroupSummary(...) functions.