Basic Techniques For The Double Valve Bass Trombone is a method by Allen Ostrander for the Double Valve Bass Trombone. Written in English it includes much advice and instruction to obtain the best sonority while gaining in speed and agility. The positioning is part of the legend in the book and each lesson is followed by some direct applications and exercises. This method is recognised as one of the best to acquire the best technique of the instrument: it is a must-have for those willing to gain in technique and skills. Allen Ostrander (1909-1994) is an American trombonist who played innumerous orchestras including National Symphony Orchestra and the New York Philharmonic.