Book excerpt: Beethoven's Sonata, Opus 27, No. 2, was not known as the "Moonlight Sonata" during his lifetime. The name has its origins in 1832, in remarks by the German music critic Ludwig Rellstab, as he likened the effect of the first movement to that of moonlight shining upon Lake Lucerne. The name caught on quickly, and later in the nineteenth century, it could be said that the sonata was "universally known" by that name.