 As pianist and organist, Frey has performed with many symphony orchestras including the Berlin Philharmonic, San Francisco Symphony, Leipzig Gewandhaus Orchestra, Munich Symphony Orchestra, Hollywood Bowl Orchestra, the Vienna Radio Symphony Orchestra (ORF), Rundfunk-Sinfonieorchester Berlin (Berlin Radio Symphony Orchestra), Orchestra dell'Arena di Verona, Deutsches Symphonie-Orchester Berlin, Rome Philharmonic Orchestra, the orchestra of the Teatro Regio di Torino (with whom he appeared as soloist in the 3 inaugural concerts opening Torino's newly restored opera house), the Cairo Symphony Orchestra, Orquesta Sinfónica del Estado de México (State of Mexico Symphony Orchestra), Bohemian Symphony Orchestra Prague, the chamber orchestra of the Palacio de Bellas Artes (the chamber orchestra of the opera house of Mexico City), Orchestra Filarmonica Italiana, Monterrey (Mexico) Symphony Orchestra (UANL), Orchestra Sinfonica Siciliana and Berliner Bach Akademie among others, under such conductors as Claudio Abbado, John Mauceri, Michael Tilson Thomas and Howard Shore.He frequently played recitals with the renowned Grammy Award-winning tenor, Jerry Hadley.Frey has performed chamber music with violinist Ruggiero Ricci and the Vermeer Quartet, among others.