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Wolfgang Amadeus Mozart's String Quartet No. 19 in C major, K. 465, is famously known as the "Dissonance Quartet" because of its unusual and dissonant introduction. Here are some interesting facts about this composition:

1. The "Dissonance Quartet": As mentioned, the quartet is nicknamed the "Dissonance Quartet" due to the startling dissonances in the slow introduction. This was quite unconventional for its time, as most compositions of that era typically started with a more consonant and pleasing harmonies.

2. String Quartet in C Major: It's one of Mozart's six quartets dedicated to Joseph Haydn, and it is the last of the set. These quartets are often referred to as the "Haydn Quartets" as they were dedicated to Mozart's friend and fellow composer, Franz Joseph Haydn.

3. Dedicated to Haydn: Mozart held Haydn in high regard, and he dedicated these quartets to him as a sign of his deep respect and admiration. These quartets are considered some of Mozart's finest chamber music compositions.

4. Published in 1785: Mozart composed this quartet in 1785. It is also sometimes referred to as "K. 465" in reference to its entry in the Köchel catalog of Mozart's works.

5. Four Movements: Like most classical string quartets, this piece consists of four movements:

   • Adagio - Allegro: The first movement begins with the famous dissonant introduction before moving into a lively allegro.
   • Andante cantabile: The second movement is a lyrical and beautiful andante.
   • Menuetto: The third movement is a graceful minuet with a contrasting trio section.
   • Allegro molto: The final movement is a spirited allegro molto.

6. Influence on Later Composers: Mozart's "Dissonance Quartet" had a significant influence on later composers, including Beethoven. The innovative use of dissonance in the introduction was a departure from the norms of the time and had a lasting impact on the development of string quartet writing.

7. A Unique Piece: This quartet stands out in Mozart's chamber music repertoire for its daring and innovative use of dissonance, making it an intriguing and often-discussed work among musicologists and classical music enthusiasts.

8. Performance and Recordings: String Quartet No. 19, like many of Mozart's compositions, is frequently performed and recorded by various chamber music ensembles. You can find numerous renditions that showcase different interpretations of this remarkable work.

Mozart's String Quartet No. 19 in C major, K. 465, is a testament to his genius and willingness to push the boundaries of classical music composition. It continues to be celebrated and analyzed for its daring harmonic choices and its contribution to the evolution of the string quartet genre.