The Schubertiade has announced its latest series of broadcasts for the week starting on August 17. The first showcase will present soprano Sumi Hwang, baritone Johann Kristinssons, pianist Ammiel Bushakevitz, and clarinetist Clara Hoffer in such works as “Die junge Nonne,” “Nacht und Träume,” “Licht und Liebe,” “Antigone und Oedip,” “Der zürnenden Diana,” “Sehnsucht (D 516),” “Lied eines Schiffers an {…}