Figure 6.22  Kol Nidrei spectrograms

Here are the spectrograms for the cello and viola solos shown in the figure. A recording on Spotify is at the bottom of the page.

Cello solo   

Viola solo

Although neither recording is on Spotify, you can listen to this recording. The cello solo starts at about 50 seconds. The vibrato on the second half of the first note is clearly audible.