Honoring the tradition of the universally celebrated jazz brunch, Overtone Window brings two hours of jazz programming UncertainFM every Sunday at 11 a.m. EST. Hosted by Eddie Hebert, a lifelong lover of jazz in its various forms and amateur drummer, the show takes an expansive view on the time-honored question of “what is jazz?”, assembling a playlist that spans a century -- 1920s to 2020s -- and embarking on a journey through singers, big-band, bebop, hard bop, cool, avant-garde, soul, fusion, acid, Brazilian, electronic, and everything between and outside. The major players are here -- from Duke Ellington, Ella Fitzgerald, and Billie Holiday to Chick Corea, Pat Metheny, and Esperanza Spalding -- but the show draws open the curtains to shine light on a variety of artists. The name derives from a pun on Overton Window, and how that social policy range can also apply to jazz as debated between traditionalists and the avant-garde.