A group should only be listed if it's one you would vote for. You could add every prog band from the 70s, but there's not much point except for having a more complete list - but such a list would also contain a lot of useless info that you'd have to mentally filter out (every band with 0 votes).
A way to construct a more proper poll may be to start with one band and then just add more as they get votes by posts in the thread .. then you'd just have to make sure the people who posted actually vote for the band after it's been added to the poll.
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