There seems to be a difference of opinion. One is that the 5-string came first and the plectrum was a simplification of that while the other is that the four string came first and the fifth string was added.

Anyway, I now have an idea what it is, although I am not sure I have ever heard a banjo band.

Philadelphians: What kind of banjos do the string bands play in the Mummers' parade on New Years day? I saw plenty of the parades when I was a kid; but I didn't pay any attention to banjos at the time.

Bob. I have noticed that there are very few five-string banjos in second-hand shops here in Sydney, whereas I have seen some four-stringers. Now that I am aware of the tenor vs plectrum. I will look more carefully to see which ones I see most often.

We might have a celebrity in our midst. Bob, are you the Bob Bolton mentioned in "Band in a Waistcoat Pocket"?

Murray