Geoff Castellucci

Geoff Castellucci is an American singer and musician widely celebrated for his exceptionally deep vocal range and “low bass” performances. While he is a founding member of the popular a cappella group VoicePlay, he has gained significant individual fame as a solo artist through his innovative arrangements and multi-track vocal videos.

Genre: A cappella, Folk, Country, and Cinematic Pop.

Most Important Albums/Songs: His solo discography is anchored by popular singles and covers such as “Sixteen Tons,” “Far Over the Misty Mountains Cold,” “Big Bad John,” and “The Sound of Silence.” His album Dusty Old Songs highlights his penchant for reimagining classics with a rich, resonant bass twist.

Why He Is Known: Castellucci is primarily known for his “sub-harmonic” singing technique, which allows him to hit notes far below the standard bass range. He has built a massive online following by producing high-quality music videos where he often performs all vocal parts—from soaring tenors to floor-shaking bass—creating a one-man a cappella ensemble.