This week Eighth Blackbird presents two exciting concerts at the Museum of Contemporary Art. Last year they played programs called Powerful and Powerless, the first focusing on pieces with political content and the second consisting of works without clear meaning or external reference, and this week’s concerts take a similarly binary approach within the context of the museum’s current exhibition The Language of Less (Then and Now), which addresses various iterations of minimalism. Thursday’s concert, the Music of Less, features minimalist works, and Saturday’s program, the Music of More, presents music crammed with ideas.