Which of the following is not a tempo marking?

Forte is not a tempo marking; it refers to dynamics in music, indicating loudness, rather than the speed at which a piece should be played. The other options—Moderato, Largo, and Adagio—are all specific tempo markings used to guide musicians on how fast or slow to perform a piece.

Moderato suggests a moderate speed, Largo indicates a very slow tempo, and Adagio represents a slow, leisurely pace. Each of these markings helps musicians maintain the intended feel of the composition, while forte focuses on the volume of sound produced. This distinction emphasizes the different roles that tempo and dynamics play in musical performance.