Marimba Concerto Analisys

Hi all!
I am looking for some analisys about the following pieces:
– Paul Creston : Concertino for Marimba
– Darius Milhaud: Concerto for Marimba/Vibraphone
– Minoru Miki: Marimba Spiritual
– Emmanuel Sejourne: Concerto for Marimba
– Jorge Sarmientos: Concerto for Marimba
– Anders Koppel: Concerto for Marimba No.1

Best wishes for everyone!