A musical note is a symbol that represents a specific pitch and duration of sound in music. Each note corresponds to a particular frequency, which determines how high or low the sound is. For example, the note A is often used as a reference pitch in music, and it vibrates at 440 Hz. Notes are arranged on a staff, which helps musicians read and play music accurately. In addition to pitch, musical notes can vary in length, indicating how long they should be held. Common note types include quarter notes, eighth notes, and whole notes. Together, these notes create melodies and harmonies that form the foundation of songs and compositions.