This month at the John F. Kennedy Center for the Performing Arts, the National Symphony Orchestra will present Verdi’s Otello in concert opera format. WETA Classical’s June NSO Showcase will reflect this operatic theme, presenting Dvorak’s Othello Overture, and Mahler’s Symphony No.4 with its heavenly 4th movement sung by soprano Katerina Burton. The program will close with a suite from Richard Strauss’ opera, Der Rosenkavalier.