The Sugar Honey Iced Tea
cello, banjo, ukelele, banjolele, mandolin, concertina, kickdrum/drumasaur, kazoo, and tamborines (yes, plural) with 4 part harmonies
We have been described as female Fleet Foxes, female Beach Boys, and walking in grass with no shoes.
Also, Barbershop Folk
We use the term Folk Do-Wop.