While millennial hardcore fans go crazy over the Refused and At the Drive-In reunions announced this week, a certain other type of music fan is palpitating at the reunion of Montreux. Launched in the mid-’80s with a live recording from the Swedish jazz festival of the same name, Montreux honed a smooth hybrid of jazz, folk and composition for Windham Hill Records. Playing together for the first time in 20 years at the behest of Napa Valley Opera House director Peter Williams, Darol Anger, Mike Marshall, Michael Manring and Barbara Higbie relive the glory on Sunday, Jan. 15, at the Napa Valley Opera House. 1030 Main St., Napa. 7pm. $25—$30. 707.226.7372.