Giacchino's influences include John Williams, Henry Mancini, Alan Menken, Elmer Bernstein, Jerry Goldsmith, Buddy Baker, Dave Grusin, Bruce Broughton, Lalo Schifrin, James Horner, John Barry, Howard Shore, Leonard Bernstein, Joel McNeely, Elliot Goldenthal, Alfred Newman, Joe Hisaishi, Ludwig Von Beethoven, Claude Debussy, Maurice Ravel, Tan Dun, Charles-Valentin Alkan, Erich Wolfgang Korngold, Irwin Kostal, Frank DeVol, Wolfgang Amadeus Mozart, Franz Waxman, Richard Wagner, Irwin Kostal, Max Steiner, Alex North, Hoyt Curtin, Warren Barker, Dominic Frontiere, Leith Stevens, Walter Scharf, Carl Brandt, Dick Grove, Bill Conti, Mundell Lowe, Allyn Ferguson, Matt Dennis, Jack Feierman, George Bruns, Nadia Boulanger, Edward Elgar, Pyotr Tchaikovsky, Gustav Mahler, Alex North, Victor Young, Roger Sessions, Arnold Schoenberg, Giacomo Puccini, Hans Richter, Thomas Tallis, Hamilton Harty, Jan Kubelík, Carl Nielsen, Sergei Prokofiev, Cole Porter, Rudolph G. Kopp, Ernst Krenek, Glenn Miller, Gioachino Rossini, Miklós Róza, Benjamin Britten, Frédéric Chopin, Mario Castelnuovo-Tedesco, Morton Gould, Fred Steiner, Leonard Rosenman, Leith Stevens, Marius Constant, Oliver Wallace, Frank Churchill, Bernard Herrmann, Hoyt Curtin, Alexandre Desplat, Benny Goodman, Duke Ellington, Herbie Mann, Nat King Cole, Herb Alpert, Bill Evans, Erroll Garner, Jerry Fielding, Louis Prima, Earle Hagen, Peter Nero, William Lava, Anton Rubinstein, Ferruccio Busoni, Ethelbert Nevin, Edvard Grieg, Johannes Brahms, Robert Schumann, Felix Mendelssohn, Carl Reinecke, Franz Schubert, Joseph Haydn, Johann Georg Albrechtsberger, Johann Sebastian Bach, Arthur Honegger, Nikolai Rimsky-Korsakov and Richard Strauss.