16.1 Challenges and Opportunities16.2 Nonnegative Matrix Factorization in the Case of Music16.3 Taking Advantage of the Harmonic Structure of Music16.4 Nonparametric Local Models: Taking Advantage of Redundancies in Music16.5 Taking Advantage of Multiple Instances16.6 Interactive Source Separation16.7 Crowd‐Based Evaluation16.8 Some Examples of Applications16.9 SummaryBibliography