De Doelen, Rotterdam. Conrad van Alphen conducts Sinfonia Rotterdam, the Octopus Symphonic Choir, and four vocal soloists in a performance of Ludwig van Beethoven's Symphony No. 9 in D Minor, Op. 125 at De Doelen, Rotterdam, in 2019. Van Alphen founded Sinfonia Rotterdam in 2000. Under his passionate leadership, this orchestra has developed into one of the Netherland's best-known orchestras. Beethoven's Symphony No. 9 is widely considered Beethoven's greatest composition. He completed this symphony in 1824, when he was almost completely deaf. This symphony is unique, since Beethoven included a choir and vocal soloists in the last movement, in which he set parts of Friedrich Schiller's poem "Ode an die Freude" ("Ode to Joy") to music. The symphony consists of four movements: Allegro ma non troppo, un poco maestoso, Molto vivace, Adagio molto e cantabile, and Finale. The four vocal soloists are Gulnara Shafigullina (soprano), Claire Barnett-Jones (mezzosoprano), Matthew Newlin (tenor), and Frederik Bergman (baritone).