Plus-Minus Ensemble, formed in 2003 by Joanna Bailie and Matthew Shlomowitz, is distinguished by its interest in avant-garde, conceptual, and experimental open instrumentation pieces such as Stockhausen‘s 1963 classic, from which the group takes its name. This 40-minute “lecture piece” includes musical demonstrations that draw on scholarship from a range of fields to explore how we make judgements about music and whether a piece of music can be inherently bad, or whether such judgements are simply subjective.