Jon Catler is one of the world's leading innovators on microtonal guitar. For many years, Catler's interest has been in the exploration of the notes-between-the-notes, or microtonal music. Specifically, he has devised his own system of tuning based on Just Intonation or the pure intervals of the Harmonic Series. He has redesigned his guitar to allow an unprecedented range of consonance and dissonance, alternating between a 64-note per octave fretted guitar and a fretless.Noted for his work with legendary composer, La Monte Young, Mr. Catler can be heard as featured soloist on the Gramavision double-CD La Monte Young and the Forever Bad Blues Band. The CD has been widely reviewed (four stars in Rolling Stone) and the band has toured Europe and played Alice Tully Hall, the Kitchen, and The Knitting Factory. He has appeared as composer and performer on the Futurismo/Futurismi Festival, Manca Festival, Montreal Jazz Festival, Quebec Festival d'Ete, the Angelica Festival and the American Festival of Microtonal Music of which he is co-founder. Catler performed in the world premier version of Ives' Universe Symphony at Lincoln Center, a climax of AFMM's 25-year history. Catler also performed on the original Harry Partch guitars with Newband in a performance of Partch's Oedipus at The Metropolitan Museum of Art in NYC.Catler has recorded and performed throughout Europe and the U.S. with many Just Intonation groups, and can be heard on The Microtones' recording Cowpeople on the M-Tone label which features his own compositions.