The Sound Library Series is designed for musicians interested in composing and recording their own music. Each package is mad e up of the 3 main components: The CD-rom the Audio CD & the Book. The CD-rom is completely filled with professional-quality audio loops that have been specially prepared to help you create amazing original music. The Audio CD contains 99 tracks an d is included as bonus so that you can quickly hear a demonstration of each of the 101 basic drum beats.