In the Mexican song Cielito Lindo, the refrain starts out like this:

Ay, ay, ay, ay,
Canta y no llores...

I can't work out the endings. Canta looks like 3p sing. present tense; chores looks like 2p sing. present. Seems like both should be imperative: "Sing and don't cry." Wassup? Or is it just a dialect thang?