Music Information Retrieval Evaluation eXchange (MIREX) is a collective effort to evaluate cutting-edge methods for various MIR tasks. Since 2005, MIREX has been an integral part of ISMIR. This year, ISMIR features the following MIREX-related events:
Plenary summary of tasks and results of MIREX 2015
Report of User Experience tasks, GC15UX
Plenary discussion of MIREX 2016 and GC16UX
Poster session of MIREX 2015 participants
You can find more information about Mirex here.