In string performance, what does "ondulé" refer to?

The term "ondulé" in string performance actually refers to a particular bowing technique that creates a wave-like or shimmering effect, which can be likened to playing two adjacent strings in a manner similar to tremolo. This technique involves smoothly alternating between these strings, contributing to an undulating sound that enhances the musical texture.

Understanding this context highlights the importance of producing a fluid and flexible sound, often found in various strings-based compositions where expressiveness and dynamic movement are essential. The other options, while related to string technique in general, do not specifically capture the essence of what "ondulé" describes in performance practice. For instance, using a heavy bow or playing slowly and smoothly does not capture the distinctive wavering characteristic of "ondulé," which relies on the interplay between adjacent strings to achieve its unique sound.