Which of the following is NOT a consideration of the Art Song?

The answer is correct because the emergence of the art song did not lead to the disfavor of librettists. Instead, art songs were often composed by composers who valued the role of text and poetry in their music. Many art songs featured texts written by skilled poets, and composers worked carefully to match the musical setting to the emotional nuances of the lyrics. The relationship between music and text is essential in art songs, and thus librettists continued to play an important role in this genre.

In contrast, the other aspects mentioned in the choices are foundational characteristics of the art song. The meticulous attention to the emotional content of the text is a hallmark of art song composition, where the music enhances and complements the lyrical message. The solo voice is also a primary vehicle for conveying the music's sentiments, often combined with piano accompaniment, which provides the harmonic foundation and texture. These elements underscore the significance of both musical and literary artistry in the creation of art songs.