Haydn was an music influence person in classical period and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet". A central characteristic of Haydn's music is the development of larger structures out of very short, simple musical motifs, often derived from standard accompanying figures. The most famous example is the sudden loud chord in the slow movement of his "Surprise" symphony; Some characteristic examples of Haydn's "rollicking" finale type are found in the "London" symphony No. 104, the string quartet Op. 50 No. 1,