"Hammerschlag has a complete command of his instrument and yet his choice is often to make the simplest and most profound note choice possible. His warm, buttery tone combined with his thorough knowledge of western harmonic languages make his improvisations a lesson in a kind of empathic logic-structure-building. He has a unique and sometimes bizarre sense of humor that often comes out forcefully through his music. His depth of focus, cultivated through years of meditation and practice gives his phrasing a kind of irresistible magnetism."

     - Aaron Alexander

Arnold has performed with Sam Bardfeld, Will Holshouser, Aaron Alexander, Ethan Iverson, Julian Priester, Jay Clayton, J. Anthony Granelli, Jerry Granelli, Jim Knapp, Greg Wall, Matt Darriau, Briggan Krauss, Michel Gentile, Owen Howard, Pete Epstein, Alex Harding, Tricia Woods, Chris Komer, Brent Arnold, Katie Down and Phil Haynes.