F major, 4/4 time.

Sinfonia No. 8, centrally located among the 15 Sinfonias, possesses a character contrasting with the preceding and following pieces. Despite its lively character, it is notably constructed with strict counterpoint. It consists of four subject expositions and three episodes.

The concise one-measure subject presented at the beginning is introduced in the order of middle voice, upper voice, and lower voice, and, after the first episode (measures 4-5) which uses the opening motive of the subject, it is exceptionally re-presented in the dominant key (measures 5-7). In the latter half of measure 7, the middle voice rests, signaling the start of a new second exposition. Here, the upper and lower voices first modulate through sequential progression while forming a stretto (from measure 7), and the resting middle voice then joins in G minor, developing the material (from measure 11). Following a relatively short second episode (measures 15-17), the third exposition (measures 17-19), and the third episode (measures 19-20), the subject returns in the tonic key in the lower and upper voices in measure 21, concluding the piece.