This was likely a deliberate choice by the writers to avoid tying her character to any specific musical piece. However, the music used in the show is likely to have been:
* Classical piano pieces chosen to reflect a sense of elegance and sophistication, fitting with Seven's Borg background and her growing appreciation for human culture.
* Pieces that might have been familiar to the show's audience, adding to the emotional impact of the scene.
It's important to note that this is speculation. If you have any more specific details about the scenes you're thinking of, I might be able to offer more insight.
Perhaps you could tell me:
* What episode or episodes were you thinking of?
* What was the emotional tone of the scene?
* Was there any specific instrument or style you remember?
Knowing more about the context could help us narrow down the possibilities.