A cantabile movement , or simply a "cantabile", is the first half of a double aria , followed by a cabaletta . The cantabile movement would be slower and more free-form to contrast with the structured and generally faster cabaletta. Louis Spohr subtitled his violin concerto No. 8 "in moda d'una scena cantata," "in the manner of a sung [operatic] scene"; opera arias exerted a strong influence on the "singable" cantabile melodic line in Romantic writing for stringed instruments .
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