The composition or writing of songs.

the art of composing descriptive music.

Music. The application of the principles or methods of serial composition (see serial, adj. 8); the composition of serial music.

the action or result of verticalizing.

= madrigalism, n.

A musical feature characteristic of a madrigal, spec. a word or phrase set to music in a way which vividly illustrates its literal meaning.

Among science fiction and fantasy fans: the writing or performing of filk songs.