At first, I heard the ladies screaming and the fearful part of my brain wanted to run back to the Posada. Then, I saw the gyrating fringed chaps and tight almost turquoise leather pants and realized I was hearing the gritos (shouts) of fans welcoming Banda Maguey to the Zocalo.
I have looked them up on the web; they have a ton of YouTube videos showcasing their songs and their own site: http://bandamaguey.com.mx.
By the way, maguey is a form of the agave plant. This is what is used to make mescal, an alcohol similar to tequila, distilled in Oaxaca. A teacher once told me, “Para todo mal: mescal, y para todo bien: tambien” (For everything bad: [drink] mescal, and use it for everything good, too).
shewhodaresnothing 