What is a symphony in C major?

A symphony in C major is a type of musical composition for orchestra, typically in four movements and lasting between 20 and 40 minutes. The C major tonality is considered "bright" and "cheerful", and is the most common key for symphonies. Some famous symphonies in C major include Beethoven's Symphony No. 1, Brahms' Symphony No. 1, and Mozart's Symphony No. 41.