Set in 1966, Sakamichi no Apollon follows Kaoru Nishimi as he moves from his home. At his new school be befriends the local delinquint, and is introduced to jazz.
Now while that sounds pretty great, especially as someone who loves jazz, here's the kicker: it brings together one of the greatest anime directors, and the greatest anime composer, for the first time since Cowboy Bebop.
The director is Shinichiro Watanabe, who directed Cowboy Bebop, Samurai Champloo, and parts of The Animatrix.
The composer is Yoko Kanno, who...is basically the patron saint of music. She composed for Cowboy Bebop, Ghost in the Shell, Darker Than Black, several Macross series, etc., etc.