9 Theory is the solo project of eclectic producer, singer/songwriter, and recording/mixing engineer, Gabe Lehner, who has been passionately focused on creating music for 20 years, perhaps most notably with the past projects Inspired Flight and Metrofique.  With a love for learning guitar and writing songs that slowly evolved into an obsession with producing, recording, and making beats, Gabe has come into his own as a renowned producer with a knack for effectively blending different genres of electronic, indie rock, and hip-hop into an original, unique sound, and has become an impressive remix artist using this signature sound as well. He has also come into his own as an experienced and charismatic performer playing hundreds of live shows; performing at music festivals such as Coachella, Lightning In A Bottle, Camp Bisco, and Electric Forest, and billing with artists the likes of Thievery Corporation, Bonobo, STS9, Beats Antique, and Emancipator.

The culmination of Gabe's 20-year journey has led to the birth of his first solo project, 9 Theory, which combines many different genres into a beat-heavy electronic sound with flavors of hip-hop and indie rock that has been compared to acts like Gorillaz, Radiohead, Postal Service, and DJ Krush. Although 9 Theory is based around Gabe's own production and songwriting it also involves numerous collaborations and featured guests, including female vocalists and MC’s both on the recorded music and in the live show.

9 Theory’s debut album, Against The Odds Of Entropy, features collaborations with MCs Killer Mike of Run The Jewels, Killah Priest of Wu-Tang, Eligh and Scarub of Living Legends, Marv Ellis, and female vocalists Sophie Barker of Zero 7, Dawn Mitschele, and Erica Dee.

9 Theory's follow-up EP, Beautiful Things, feautres collaborations with Torii Wolf, Ashley Mazanec, and Dawn Mitschele.