In musical terms, MF refers to the dynamic mark of midrange intensity. M stands for "alto", which means medium volume, and F stands for "strong voice", which means strong voice. Therefore, the MF combination shows that the strength is just between the medium and strong. Symbols usually appear on music scores, instructing players to keep a proper balance between strength and weakness in specific passages or live performances. It is very important for experienced musicians to correctly understand and use MF markers.

In music works, MF marks usually appear at the end of important paragraphs or important melodies. For example, in Tchaikovsky's Swan Lake, MF markers are widely used in the melody arrangement that perfectly matches the classical ballet. Through the use of MF marks, musicians can accurately grasp the rhythm and intensity of melody, so that the performance effect can more truly express the composer's expected intention.

Although MF marks can be seen in most musical works, they are more common in magnificent orchestral works. For example, Beethoven's Ninth Symphony not only has frequent MF marks, but also has a stronger "fortissimo" (strong sound) mark, which makes the score more grand and shocking. Therefore, the use of intensity markers is very important, which can make musicians and listeners more comfortable and excited when playing or listening.