What does 'Rubato' imply in musical performance?

'Rubato' refers to a technique in musical performance where the tempo is flexible and can be adjusted freely to enhance emotional expression. This means that a performer may speed up or slow down the rhythm slightly without disrupting the overall tempo of the piece. This practice allows for personal interpretation and the conveying of deeper feeling within the music. The use of rubato creates a sense of ebb and flow, which can be particularly effective in expressive passages, allowing musicians to inject their own artistic sense into the performance.

In contrast, the other options describe different musical qualities that do not capture the essence of rubato. For example, 'spirited' conveys a sense of liveliness or energy, which does not necessarily involve tempo flexibility. 'Quiet, tranquil' suggests a calmness or softness but lacks the dynamic and expressive elements inherent in rubato. 'Lively, brisk' implies a fast tempo that is consistent and energetic, again failing to embrace the nuance and emotional depth that rubato provides. Thus, the correct understanding of rubato centers on its role in facilitating expressive freedom through tempo variation.