Meet the members of Bats’i Rock group Sak Tzevul who visited Colgate University last week: Damian Martínez, the lead vocalist and guitarist, Paco Martínez, who plays guitar, Enrique Martínez, the drummer, and Otto Anzures, who plays bass. 28 years ago in the Mayan village of Zincantán, in Chiapas, Mexico, Damian Martínez founded the band with.