For every youth choir, the process of transitioning from unison to multi-part singing is an exciting journey. Chorissimo! blue, the new unison volume in the successful choir series chorissimo!, accompanies and supports this process: on one hand, with a comprehensive, carefully selected, and stylistically diverse repertoire of pieces designed for flexible use, and on the other hand, with versatile practical materials that include playback, audio, and practice tracks, as well as a video clip DVD. The curriculum-structured volume guides singers through six steps from unison singing to canons and quodlibets, leading to homophonic and polyphonic two- and three-part singing, making it ideal for music education in lower secondary schools. Various workshops, some illustrated through video clips, address individual aspects of choral work.