Which musical markings indicate a smooth transition between notes?

The correct answer highlights the use of slurs as musical markings that indicate a smooth transition between notes. A slur is a symbol in music notation that connects two or more notes, instructing the performer to play them in a legato style. This means that the notes should be sung or played smoothly and connected, without any perceptible gaps or breaks between them. The presence of a slur encourages musicians to focus on the fluidity of their phrasing, creating a more expressive and cohesive performance.

In contrast, staccato is characterized by short, detached notes, which contrasts with the smoothness conveyed by slurs. Legato is a term often used to describe the style that slurs promote, but it is not a specific marking. Forte, referring to a loud dynamic level, does not relate to the transition between notes or their smoothness. Understanding the role of slurs in music can greatly enhance one's ability to perform pieces expressively and accurately.