While most symphonies have a number, many symphonies are known by their (nick)name. This article lists symphonies that are numbered and have an additional nickname, and symphonies that are primarily known by their name and/or key. Also various compositions that contain "symphony" or "sinfonia" in their name are included, whether or not strictly speaking they adhere to the format of a classical symphony. Sinfonia concertante is a different genre, and works of that genre are not included here, unless for those named works that are usually known as a symphony.