Final answer:
The melodic movement in the bridge of the first movement of 'Eine kleine Nachtmusik' is descending, where the pitch of the notes decreases.
Step-by-step explanation:
The melodic movement in the bridge of the first movement of Eine kleine Nachtmusik by Wolfgang Amadeus Mozart can be described as descending. This section of the piece features a series of notes that lower in pitch, creating a downward melodic line.
The melody gently falls in register, often creating a contrasting section to the preceding themes that may have included ascending scales or arpeggios.