While his voice has a rich and powerful sound, it falls into the tenor vocal range. You can find evidence of this by looking at:
* His musical performances: His singing style and the repertoire he typically performs (often operatic and musical theatre roles) are consistent with a tenor voice.
* Vocal coach and expert opinions: Vocal coaches who have worked with Mark Bautista have confirmed his vocal classification as a tenor.
Therefore, Mark Bautista is definitively a tenor, not a baritone.