A polythematic, imitative fantasia in a loose sense of the term. An interesting but rather undirected work. Its thematic logic is cogent, but the dramatic energy seems rather spasmodic and picturesque although this could be a performance problem. The title indiates that “The following Fantasia is in the first and second modes and because and because it draws from and mixes the two it will be said to be in a mixed mode, and it has to be played with the same speed as the previous fantasia,” that is, neither slow nor fast.

The work is interesting because it can be sectionalized according to germinal motivic cells of which there are three. These are largely rhythmic shapes, with variable and varying melodic composition: (1) QQ QQ QQ | C; (2) QQ | C; (3) |QQ C [Q = quaver; C = crotchet]. Compare these themes with the preceding work, Mi41.
Each section is built on 1 germinal cell. There is much use of sequence and little true imitation. The themes all in short note values almost like an imitative redoble fantasia.