In rehearsal, you notice that the performers seem to be out of key when using the Example 1 score. In what key is the Example 1 score? In what key should the musicians be playing based on the Concerto score?

To determine the key of Example 1 and what key the musicians should be playing based on the Concerto score, I would need to see that specific sheet music or have a description of it, as well as the details about the Concerto score. Generally, if performers are out of key, it often indicates a discrepancy between concert pitch and the written score (for example, a transposing instrument being played in a different key than intended).

If you have specific excerpts or details from the Example 1 score and the Concerto score, feel free to share them! This information would allow me to help you identify the keys accurately.

In rehearsal, you notice that the piece sounds correct, but the Example 2
score does not look quite right. Explain the error in the Example 2 score.

Without seeing the actual Example 2 score or having specific details about its contents, I can provide a general approach to identifying common errors in musical scores. Here are some potential issues to consider:

1. Key Signature Mismatch: The key signature in the score might not match the actual key in which the piece is being performed. This can happen if the score is written for a transposing instrument (like B♭ clarinet or E♭ alto saxophone) without noting the correct concert pitch.

2. Time Signature Confusion: Sometimes scores may appear to have the wrong time signature or may not correctly reflect changes in tempo or meter that should be noted throughout the piece.

3. Incorrect Pitches: The pitches in the score might be miswritten, such as notes appearing a step higher or lower than they should be, which can result from an error in transcription.

4. Accidentals: There might be missing accidentals or incorrect markings which could lead to confusion about whether a note is sharp or flat.

5. Dynamics and Articulations: If the performance sounds correct but the dynamics or articulations in the score seem off, it could indicate that the performers are interpreting the music based on their understanding or an underlying version rather than what's notated.

6. Instrumentation Issues: Double-check that the coordinated instrumentation matches what is needed for performance. For instance, if a part is meant for a flute but is marked for a different instrument, this could lead to confusion.

If you can provide specific details about the content of Example 2, I could offer a more targeted analysis of any potential errors present in that score.