Notecracker Vocal Warm-Ups, Paperback by Power, Ruth (EDT), ISBN 1783053496, ISBN-13 9781783053490, Like New Used, Free shipping in the US

(Music Sales America). These pocket-sized swatch packs are great for quick reference at home or on the go. Each Notecracker contains 70 handy reference cards, printed on both sides for quick access to chord diagrams, general music theory, jokes, quotes and snippets of musical trivia. Notecracker Vocal Warm-Ups is a selection of easy vocal warm-ups for all voices.