Brian Simpson

What is your ideal summer-jazz heat signature? Cool and refreshing, like a standard sung by Stacey Kent? Or bright and blazing, like an uptempo blues by the Marel Hidalgo Organ Trio?

From the free-jazz firebrands Irreversible Entanglements to the smooth-jazz veteran Brian Simpson — it's all in a week's offerings at Moment's Notice, our guide to Philadelphia's live jazz scene.