While the lyrics describe a bright scene of a fair, the accompanying music sounds somewhat melancholic. Nevertheless, compared to other works by Mompou, it is more cheerful, written in a brilliant B major, and marked Allegro ritmico. However, rather than a vivid depiction of a fair unfolding before one's eyes, the music evokes a faded memory, as if reminiscing about the past. Furthermore, the word "fira" (fair) refers not to an everyday event like a weekly morning market, but to something special, such as a traveling exhibition, amusement park, or exposition. Thus, this song likely recounts the memory of a special day in childhood. The opening is in 3/8 time, and the piano prelude begins with a percussive repetition of F-sharp notes. The first stanza is quite lively, with fifths and ninths added to the vocal melody by the piano, creating a colorful and mysterious world. On the second beat of each measure, the open fifths of B and F-sharp resonate, sounding like percussion or the accompaniment of a rural folk song. The subsequent lyrics describe "cutò de sucre (cotton candy)," "cavallets (merry-go-round)," and "brogit dels platerets (sound of cymbals)," but the vocal range is lowered, and the piano shifts to a subdued tone, as if processing the scene into sepia. In the interlude, the theme of the first stanza reappears lively, as if recalled. The middle section is in 6/8 time, reminiscent of a lullaby or barcarolle. The arrival of night and the closing of the fair are romantically depicted with arpeggiated chords. Additionally, the vocal line features repeated duplets and chromatic descents, evoking a sky gradually darkening. Finally, it returns to 3/8 time, and the theme of the first stanza is recapitulated meno mosso e più nostalgico, as the lively bustle of the fair sinks into the depths of memory.