The first proper orchestral concert in Iceland was held in 1921, in conjunction with the royal visit of Christian X of Denmark, the reigning monarch of Iceland. The ensemble created for the occasion was given the name Hljómsveit Reykjavíkur (The Reykjavík Orchestra), and performed sporadically in the years that followed under the direction of Sigfús Einarsson and Páll Ísólfsson. Following the founding of the Icelandic National Broadcasting Service in 1930, and the festivities at the 1000th anniversary of the Alþingi, and through the pioneering work of musicians like Franz Mixa, Victor Urbancic and Róbert A. Ottóson, this ensemble was slowly transformed into the professional symphony orchestra known today as the Iceland Symphony Orchestra. The orchestra resides in Harpa, Reykjavík's largest concert house, and holds weekly concerts in its Eldborg hall.