Mitchell Coby Michael Grassi is an American singer 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 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.

Pentatonix are an American a cappella group from Arlington, Texas, consisting of vocalists Scott Hoying, Mitch Grassi, Kirstin Maldonado, Matt Sallee, and Kevin Olusola. Characterized by their pop-style arrangements with vocal harmonies, basslines, riffing, percussion, and beatboxing, they produce cover versions of modern pop works or Christmas songs, sometimes in the form of medleys, along with original material. Pentatonix was formed in 2011 and subsequently won the third season of NBC's The Sing-Off, receiving $200,000 and a recording contract with Sony Music. When Sony's Epic Records dropped the group after The Sing-Off, the group formed its YouTube channel, distributing its music through Madison Gate Records, a label owned by Sony Pictures.