Igor Stravinsky's Concerto in D ("Basle") for string orchestra was composed in Hollywood between the beginning of 1946 and 8 August of the same year in response to a 1946 commission from Paul Sacher to celebrate the twentieth anniversary of the Basler Kammerorchester (BKO—in English, Basel Chamber Orchestra), and for this reason is sometimes referred to as the "Basle" Concerto ("Basle" being the French form of the city's name). It was premiered on 27 January 1947 in Basel by the BKO, conducted by Paul Sacher (, xii; ; , 438). Other sources say it was six days earlier, on the day of the orchestra's twentieth anniversary, 21 January (; , 348), when two other works commissioned by Sacher were also premiered: Arthur Honegger's Symphony No. 4 Deliciae Basiliensis and Bohuslav Martinů's Toccata