Vocal expression in recorded performances of Schubert songs

This exploratory study focuses on the relationship between vocal expression, musical structure, and emotion in recorded performances by famous singers of three Schubert songs. Measurement of variations in tempo, dynamics, and pitch showed highly systematic relationships with the music's structural and emotional characteristics, particularly as regards emotional activity and valence. Relationships with emotional activity were consistent across both singers and musical pieces, while relationships with emotional valence were piece-specific. Clear changes in performing style over the twentieth century were observed, including diminishing rubato, an increase followed by a decrease of the use of pitch glides, and a widening and slowing of vibrato. These systematic changes over time concern only the style of performance, not the strategies deployed to express the structural and emotional aspects of the music.