The spectrogram was created from a microphone recording of a brief portion of a YouTube video, featuring a live performance by Renee Fleming. Because this performance is not part of either performer's recorded repertoire, we shall examine instead a different spectrogram, obtained from that repertoire. The musical aspects of this spectrogram are quite similar to the ones we described for Figure 5.4 in the book. Here is the spectrogram:
This spectrogram is quite comparable to the one shown in Figure 5.4. The passage begins at 1:47. You can listen to it on Spotify:
You can buy the recording from Amazon, iTunes, or Spotify.