On this week’s Modern Notebook with Tyler Kline: A combination of fairly disparate events led composer Damián Ponce de León to create his piece “The Butterfly Route:” one was the consideration of the complex features flight paths of butterflies; another, the murder of a Mexican environmentalist leader who devoted his life to protect Monarch butterflies; and finally, the realization that the thyroid is actually shaped like a butterfly.

Then, we’ll hear a large-scale work by Louise Alenius titled “Stille Slag,” or “Quiet Beats.” And with this music, the composer asks: “What happens to the body when you are locked up? How do you hold on to yourself in an enclosed space?”

Plus music by Eric Guinivan, Allison Loggins-Hull, Helen Grime, Yuko Mabuchi, Rachael Lavelle, Aida Shirazi, Yannis Kyriakides, and others; and performances by pianist Nic Gerpe, Ensemble Pi, cellist Santiago Cañón-Valencia, Bent Frequency Duo Project, pianist Sarah Cahill, Splinter Reeds, and more.