Piano Sonatas Nos. 13 - 14, Opus 27 (Beethoven)
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Ludwig van Beethoven's opus number 27 is a set of two piano sonatas both entitled Quasi una Fantasia for their combination of freedom of form with sonata structure. They were written in 1801. For the individual sonatas see:
- Piano Sonata No. 13 (Beethoven) (in E‐flat)
- Piano Sonata No. 14 (Beethoven) (the Moonlight sonata, C‐sharp minor)