Frangs solistengasjementer har inkludert orkestre som Mahler Chamber Orchestra, BBC Symphony, Philharmonia, Liverpool Philharmonic, Gewandhausorchester Leipzig, Deutsches Symphonie-Orchester Berlin, Symphonieorchester des Bayerischen Rundfunks, Orchestre de Paris, Orchestre Philharmonique de Radio France, Tonhalle-Orchester Zurich, Russian National Orchestra, St. Petersburg-filharmonien, Washington National Symphony, Seattle Symphony, Atlanta Symphony, Toronto Symphony, Sydney Symphony og NHK i Tokyo, samt samarbeid med dirigenter som Valery Gergiev, Vladimir Ashkenazy, Daniel Harding, Mariss Jansons, Leonard Slatkin, Vasily Petrenko, Krzysztof Urbanski, Ivan Fischer, Neeme Järvi, David Zinman, Esa-Pekka Salonen og Herbert Blomstedt.