Mitch Grassi

Mitchell Coby Michael Grassi (born July 24, 1992) is an American singer, songwriter, YouTuber, and countertenor vocalist from Arlington, Texas. Known for his high tenor voice, Grassi came to international attention as a founding performer in two groups—the a cappella quintet Pentatonix, and the duo Superfruit with Pentatonix bandmate Scott Hoying. As of September 2023, Pentatonix has released eleven albums (two of which have been number ones) and six EPs, have had five songs in the Billboard Hot 100, and won three Grammy Awards as "the first a cappella group to achieve mainstream success in the modern market". As of September 2023, Superfruit's YouTube channel has over 2.4 million subscribers and has accumulated over 483 million views.

In April 2020, Grassi debuted a solo moniker, Messer, doing a DJ set of "a range of dark, techno tunes" at Paper's Club Quarantine Zoom event during the COVID-19 pandemic. "Machine" was released as Messer's debut single in July 2021, with "Angels Pray" following later that month. Messer's debut EP Roses was released August 2021.