Mireya Ramos

Four members of Mariachi Flor de Toloache perform at the US Consulate in Chennai, India, on Nov. 13, 2013. (Photo courtesy US Consulate Chennai)

Four women of Mariachi Flor de Toloache brought brightness *and* efficiency to bear at the 9:30 Club Monday as openers for The Arcs — a new band from The Black Keys’ Dan Auerbach of which they also are members.

The all-female mariachi band from New York City toured in a slimmed down line-up (which can involve up to 13 rotating members) of four, including vocalist and violinist Mireya Ramos, vocalist and guitarist Shae Fiol, trumpet player Julie Acosta, and a fourth member who I am sadly unable to identify for you. The four talented women sang songs from their self-titled debut album, and they brought spunk and spirit to the stage as an effective warm-up for The Arcs — well, effectively for themselves as well as the four blended seamlessly into The Arcs, providing vocals, strings, and horns as members of the 10-person collective.

Band founder Mireya engaged the audience with style and grace, asking Spanish speakers in the sold-out crowd to identify themselves. Although there were many delightful “Woo’s!” in the house in response, those with mastery of only the English language like myself need not have worried. Flor de Toloache played universally appealing material, and they led the audience along in several singalongs with cool aplomb.