Laying out her instruments in Gasson 100 on January 31, the flautist Kay Ragsdale prepares to deliver a lecture on “Flutes of the World,” part of the music department’s free “Music in the Afternoon” series. Ragsdale’s collection of 50 instruments includes a Chinese dizi, Indian bansuri, Yugoslavian double flute, Pacific nose flute, Native American flutes, and pan pipes from Europe and South America. For information on other music department events, visit the website.