Mitchell Coby Michael Grassi (born July 24, 1992) is an American singer, musician and songwriter from Arlington, Texas. Known for his[a] high tenor voice, Grassi came to international attention as the founder and performer of two groups—the quintet a cappella collective Pentatonix and the duo Superfruit with Scott Hoying. As of June 2021, Pentatonix has released eleven albums (two of which have been number ones) and two EPs, have had four 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 February 2019[update], Superfruit's YouTube channel has over 2.5 million subscribers and has accumulated over 392 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.
Grassi was born (1992-07-24)July 24, 1992, in Arlington, Texas, to Nel Grassi (née Fenton) and Hornell, New York, native Michael Grassi. He is of half Italian and half a mix of Scottish, Irish and Welsh descent. His parents relocated to the Dallas–Fort Worth, Texas, area in the mid-1980s for Michael's career in the airline industry. Grassi has an older sister, Jessa, and remembers doing singalongs to pop tunes and Christmas songs in homemade variety shows with her for his parents when he was very young. His uncle Tony was also "a high tenor and had an incredible range".

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