"До минор" (C minor) is a musical key that is often associated with a somber or serious mood. It consists of the notes C, D, E♭, F, G, A♭, and B♭. This key is frequently used in classical music, as well as in various genres like rock and jazz, to convey deep emotions. Many famous compositions are written in C minor, including Ludwig van Beethoven's "Piano Sonata No. 8," also known as the "Pathétique." The key's distinctive sound can evoke feelings of melancholy and introspection, making it a popular choice for composers seeking to express complex emotions.