ma·ri·a·chi 
(mä′rē-ächē)
(mä′rē-ächē)n. pl. ma·ri·a·chis
1. A street band in Mexico, usually featuring violin, guitar, and trumpet players as well as vocalists.
2.
a. The music performed by such a band.
b. A musician belonging to such a band.
[Mexican Spanish, perhaps from an indigenous language of Mexico .]