Classical piano sheet music by Friedrich Kuhlau to download and print instantly: Sonatina Op. 20 No. 1 in the key of . Level 5, compositional type: Sonata (published in 1819) Sonatina in C Major, Op. 20 No. 1 by the composer Friedrich Kuhlau who lived from 1786 to 1832. The piece was published in 1819 and is included in Kuhlau's Sonatinas.