[x] When 4 = 5

The album by 'The Marion Brown Quartet' consists of a number of different line-ups. One of them has 5 players, not 4. We have removed that line-up since it is not a quartet and it consists of another of the 4-piece line-ups plus an (assumed) interloper. That may not be the case of course, the quartet for that track may have actually included the 'interloper' and the person who is also in another 4-piece may have, at that stage, been the guest.

That aside, are we right to discard that 5-man line-up purely on mathematical grounds?

We violated math here:
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