Opus One is a wine producer located in Oakville, Napa Valley, California, known for its Bordeaux-style blend based on Cabernet Sauvignon. Opus One was founded by Baron Philippe de Rothschild, owner of Château Mouton Rothschild in Pauillac, France, and the famous wine producer from the Napa Valley, Robert Mondavi. Combining the great wine traditions and innovations of the two families, the unique goal of the founders is to create an exceptional wine in the heart of the Napa Valley. At the time, such an investment by a legendary Bordeaux family helped establish the Napa Valley's reputation as a world wine region. The first harvests bore the label Napamédoc, while in 1982 the first Opus One was released, borrowing the name from classical music, where it served to denote the first significant work of a composer. It matures in French oak barrels for about 18 months and is a blend of mostly Cabernet Sauvignon and smaller quantities of Cabernet Franc, Petit Verdot, Merlot and Malbec. The second wine, called Overture, is a combination of batches from different vintages that did not enter the final blend of Opus One. They spend extra time in the barrel to develop a more accessible and early performance. Without a doubt, Opus One is one of the best and most famous wineries in California.