This book constitutes the thoroughly refereed post-proceedings of the International Computer Music Modeling and Retrieval Symposium, CMMR 2003, held in Montpellier, France, in May 2003.The 20 revised full papers were carefully selected during two rounds of reviewing and improvement. Due to the interdisciplinary nature of the area, the papers address a broad variety of topics including information retrieval, programming, human-computer interaction, digital libraries, hypermedia, artificial intelligence, acoustics, signal processing, etc. The book comes with a CD-ROM presenting supplementary material for the papers included.