In this text for undergraduate and graduate students in technology-related music programs, George (U. of South Australia) and contributors describe computer recognition of music notation, including off-line music processing, handwritten music recognition, and lyric recognition. Chapter topics include staff detection and removal, a method of off-line optical music sheet recognition, using wavelets to deal with superimposed objects, pen-based input for online hand-written notation, lyric recognition and Christian music, and multilingual lyric modeling and management. In a section covering music description and its applications, contributors examine constructing emotional landscapes with music and modeling music notations in the Internet multimedia age. The final chapter describes evaluation in the visual perception of music.