Sources Needed I have seen this piece of music performed live at least 3 times Lucerne Festival Orchestra New York Philharmonic and Boston Symphony Orchestra In these 3 performances and the numerous DVD performances that I have seen never have I seen the Posthorn part substituted for a flugel horn Can someone provide some sort of citation for this Also this needs some serious clarification as it only makes sense to trumpet players 4 Trumpets in F B flat 2 or more high parts may be reinforced with E flat Trumpets