I am reassured that I am not the only pedant in my choral society. At the notices last night, Ticket Man got up to say "for this concert the venue is smaller, so I have less tickets to sell"
Before I could stop myself I heard myself saying (rather audibly) "fewer". I started to go red and hide, but then I realised that I had heard at least four voices at the same moment.
I think they were mainly altos. Altos are the prize witterers is both my choirs.