Interval Speller (Level 4). By John W. Schaum. For Piano. Method/Instruction; Piano - Schaum Method. Schaum Publications. Intermediate. Book. Published by Schaum Publications, Inc. (AP.44-0250).
A comprehensive workbook that covers the major, minor, diminished and augmented intervals in all keys, the Interval Speller can be used by piano, instrumental or vocal students. For self-correcting, a detachable answer sheet is included.