Song
The English term for Lied.
What it means
Song is the English word for Lied. In German usage it usually designates a song of popular music, occasionally also a song with a critical or narrative text in musical theatre. The basic form is strophic with a refrain; a layout is widespread in which the refrain follows each of several stanzas, supplemented by a contrasting middle section and often an introduction and an ending.
Musical use
For a large part of popular music, the song is the basic unit. Its form is designed for recognizability: the refrain carries the most memorable melody, the stanzas continue the text. In jazz, songs of the American repertoire are the basis of improvisation; there the chord progression of a piece serves as the model over which one improvises, while the melody appears only at the beginning and end. Such pieces are usually notated as a melody with chord symbols; the work lives in recordings and performances, not in the notated text.
Performance practice
Learn the form before the details: know where the stanza, refrain, and middle section lie and how often they recur. Keep the refrain stable in tempo and shaping and shape the stanzas according to their text. Watch for clarity of text and for a register in which the text remains effortlessly intelligible; transpose if needed. In improvised contexts, know the chord progression by heart and count along with the form. Listen to recordings, because phrasing and timing cannot be gathered from the notated text.
Bear in mind that the recording, in the field of popular music, is often the actual work: arrangement, sound, and timing belong to it and cannot be gathered from the notated text. Listen to the authoritative recordings before working out a version. In pop music, the song usually follows the layout of stanza, refrain, and bridge. In Weill, the song appears in musical theatre, for instance in The Threepenny Opera of 1928.
Check whether a version exists transposed, because this changes the register and character of the piece.