Thanks to Aimee, who alerted me to this, I've located the soundfiles available for all the Suzuki harp books. The two sites below have samples you can hear, and in the first one, the samples are long, so they contain most if not all the piece. Both sites also offer them for sale to download - a bargain if you're learning one of the tunes.
The soundfiles are played by Mary Kay Waddington who is the editor of the series, and the composer of Siciliana. It was a pleasure for me to hear how she conceived of the piece. All the playing is really nice.
https://www.prestomusic.com/classical/products/8040433--suzuki-harp-school-vol-2
https://www.amazon.com/Suzuki-Harp-School-Vol-2/dp/B00JMWX4AU