(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. All the essential chords are presented on easy to read cards with clear fingering diagrams. Whether you want to learn them one at a time or use as a quick reference guide, this handy little pack is the perfect companion for the ukulele player.