This database was created to help to evaluate of Musical Audio Signal Separation algorithms and statements on a representative set of professionally produced music (i.e. real music recordings). We include several song snips of a few seconds (10s-40s) with the following contents: Tracks (with/without effects): Stereo Microsoft PCM WAV files (44.1Khz, 24 bits) of every instrumental track including and/or without including effects (plugins enabled or disabled in the project file used for production) Description of the effects: When available, we include a description of the plugins used to modify the tracks without effects. Lyrics: When available, lyrics are included. License: All licenses allow these data sets to be used in scientific research but other may grant other priviledges (such as by-nc Creative Common licensed work). Using this dataset When the MASS dataset is used for academic research, we would highly appreciate if scientific publications of works partly based on the MASS dataset cite the following publication: @MISC{MTGMASSdb, author = {Vinyes, M}, title = { {MTG MASS database} }, howpublished = {\\\url{http://www.mtg.upf.edu/static/mass/resources} }, year = {2008}, } We are interested in knowing if you find our datasets useful! If you use our dataset please email us at mtg-info@upf.edu and tell us about your research. https://www.upf.edu/web/mtg/mass