PLEASE! Vivaldi Experts,help me find this Clical Song.?

This song had been in the movie'The Royal Tennenbaums" {Concerto per Liuto E Mandolino} It doesn't really sound like the mandolin & liuto,sounds like Piano and Cello, I am having a hard time finding any Vivaldi CD with the song on it, it's very peaceful. I don't know if there is another title for this? If anyone has seen the movie, it's 40min42seconds into it, it is playing when the shot is being filmed at Owen Wilsons house, they show some Native American art pics behind him when the Tennis player guy is confronting him, you can barely hear the Music in the background and it is only played briefly. Please, I hope someone can help me. Thank you, to any one that even tries!!!!