This sonata, one of Brahms's most favorite and well-known of the three works for violin and piano, is a penetratingly beautiful and tender composition. It is often referred to as the Rain Sonata because it takes the principal theme from his Regenlied, opus 59. The form is standard: three movements with the third constructed as a rondo. Thematically, the three repeated D's rhythmically cast as a dotted rhythm are persistent throughout each movement, helping to create a highly unified and structured work.