American Guild of Organists’ Albuquerque Chapter performs on the 1967 Walter Holtkamp 3 manual organ at Keller Hall. Guild members will try out the instrument as they wish and informally. As an educational offering, Keller Hall will be opened to the UNM students, families with children and the interested public to listen in and learn about the organ as well in the auditorium below. Come and go as you like throughout the duration of the concert. Free admission.