Band we followed around at night

In Zacatecas there is a tradition (I think especially on Saturday nights) of bands winding their way through the streets - kind of a roving party. People follow them around and drink mezcal. We heard one on Saturday night and followed it all over the city - it seemed like we went though every little alley. They were amazing entertainers. They always had something new going. The funniest thing was when we were going through a narrow alley and a dog was barking at us from a balcony above. The whole party stopped, and the band started a piece that involved barking. Every so often they'd stop and we (the whole crowd) would bark back at the dog!