Which philosophical concept from the Baroque era is associated with a single emotional expression throughout a composition?

The concept related to a single emotional expression throughout a composition during the Baroque era is known as the affections (or affects). This philosophical approach is rooted in the belief that music and art should evoke specific emotional responses in the audience. Composers and artists aimed to convey a distinct emotional state or feeling throughout a piece, creating a cohesive and immersive experience.

By focusing on the affections, Baroque artists wanted to bypass the complexities of mixed emotions and instead deliver a clear, singular emotional message. This idea aligns with the era’s aesthetic values that emphasized the power of art to stir emotions and create a direct connection with the viewer or listener.

The other concepts mentioned do not encapsulate this singular emotional expression in the same way. The politeness theory relates to social interaction rather than artistic or musical composition. The unity of effect, while somewhat similar, emphasizes the overall impact of all elements working together rather than maintaining a single emotional thread throughout. The balance principle addresses structural aspects of art and music, focusing on harmony and form rather than emotional content. Thus, the affections stand as the most directly relevant concept to the idea of a consistent emotional theme in Baroque compositions.