The Error Detection: Exercises for the Instrumental Conductor texts are designed to improve the critical listening skills of the conducting student through real music excerpts that contain planted errors in the parts for the conductor to find. Both books contain 54 excerpts from standard band literature from grades 2 to grade 6 so students gain knowledge of real music they can use later, not just non-musical etudes. The teacher's edition contains over 350 pages of materials with analysis sheets and answer keys to help the conducting teacher to easily evaluate the student's progress. The teacher's edition also comes with a CD-ROM containing all of the instrumental parts for all of the musical excerpts as PDF files, so the teacher can just print the amount of parts needed for each example, and the examples are arranged to sound satisfying with as little as five players. The Error Detection program has been tested for over 3 years at major university programs like the University of Minnesota, Illinois State University, and the College-Conservatory of Music at the University of Cincinnati.