Sorry, can't help. Only thing I can think is that each of the three items in the title refers to one of the groups e.g a Rioja moth - I did of course just make that up.
My theory about the title is that the link word (24 down) is also the name of a famous waltz by Johann Strauss - as is the title 'Wein, Weib und Gesang'. Bit tenuous though, I admit. Anyone got a better theory?