10 JAZZ SKETCHES is a set of books that will help you improve. Each book includes 10 authentic songs of different jazz genres arranged for alt sax trio. All pieces were composed by a famous jazz saxophonist and a composer - Lennie Niehaus (1929). The difficulty of these books goes up: book 1 (yellow) - level 2, book 2 (blue) - level 3, book 3 (red) - level 4 and book 4 (green) - level 5. Very interesting set!