Program: Music by Godefroid, Piazzolla, and other composers. Flutist Karen Johnson and harpist Astrid Walschot-Stapp are heard together in concert at the National Gallery, playing Etude de concert by Félix Godefroid, Café 1930 by Astor Piazzolla, and music by other composers in a program that was recorded at the Gallery in January 2010.