The Quad is a four volume set of the most frequently asked orchestra excerpts for professional auditions, edited and annotated by Hal Robinson, Principal Bass of the Philadelphia Orchestra. This volume includes excerpts from: Britten's Young Person's Guide, Bach Orchestral Suite No. 2, Brahms Symphony 2, Beethoven Symphonies 3 and 7, Mozart Marriage of Figaro, and Haydn Symphony No. 88.
In this video Hal Robinson talks about the consistency of the note lengths in this excerpt from The Young Person's Guide to the Orchestra by Benjamin Britten...
