fake book

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A book or collection of pages containing information about songs, especially their lyrics, melodies, and chord progressions, used by musicians as a substitute for standard sheet music or as a framework for improvisation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a fake in the form of an imitation book; used to fill bookcases of people who wish to appear scholarly