The performers were Gaston Blanquart (flute), Lucien-Joseph-Francis de Nattes (oboe), Louis Cahuzac (clarinet), Hippolyte Poimboeuf (alto saxophone), Gustave Dhérin (bassoon), Marcel Darrieux (violin), and Robert Krabansky (cello).

7 is scored for an instrumental septet consisting of flute, oboe, clarinet, alto saxophone, bassoon, violin, and cello, with the optional addition of an offstage tam-tam near the end.

[5] According to the composer, the opening theme's primitive, Amerindian character is gradually transformed over the course of the work into a more civilized style, eventually giving way to a slow waltz.

This is succeeded by a surging melody with conflicting rhythms, ornamented with the parasitic grace notes characteristic of the animated polquinha of the cidade nova.

7 are common to the habanera, Brazilian tangos, maxixe, and the polkas (polquinhas) of one of the originators of the choro genre, the flautist Joaquim Antônio da Silva Calado.