This isn't much to go on but i'm pretty sure it was in Star Trek First Contact as I've seen it so many times. He's standing in his ready room while looking out the window and he's listening to a classical music piece and it's playing really loud and it's then stopped as I think Riker comes in to his room. Would anyone know what the classical piece was by any chance? I'd like to hear the whole thing.
Sorry I can't be any more specific!
Sorry I can't be any more specific!