Final answer:
The key in bars 103-1100 refers to the tonal center and pitch relationships within the music.
Step-by-step explanation:
The key in bars 103-1100 is a musical term that indicates the tonal center of a piece of music. It determines the pitch relationships within the music and provides a reference point for the performer and the listener. In this context, the key indicates the specific set of pitches and chords used in those bars.