What is bajo sexto guitar?

Bajo sexto guitar is a Mexican stringed instrument that is generally played in conjunction with the twelve-string guitar in Mariachi music. It has twelve strings with six doubled pairs in the tuning of A-D-G-C-E-A. It is played by using a strumming technique on the strings and provides a deep and punchy bass sound. The instrument has a flat back and small soundhole, and its body is usually adorned with intricate designs. The bajo sexto guitar is an essential component of the Mariachi ensemble and is used to create the characteristic rhythmic and harmonic foundation of this regional Mexican music. It is also used in other styles of Mexican music, including Norteño and Tejano.