The Theremin Play-Along Book is a collection of twenty-eight imaginary parts for classical compositions that allow the Thereminist to solo along with existing recordings, integrate into a Western orchestral or chamber concert, or hone playing and listening skills by singing in an online "shower."
The volume includes selections from Puccini, Verdi, Faure, Debussy and even adaptations of Wagner's "Liebestod" and Rimsky-Korsakov's "Flight of the Bumble Bee."
Now, these transcriptions are available on Kindle!
https://www.amazon.com/dp/B0C22163M3
Hard copy and pdf are also available:
https://www.amazon.com/dp/B0BW3858VG
https://www.sheetmusicdirect.com/en-US/se/ID_No/1307711/Product.aspx
BONUS:
Here are a few more sample pages just for Theremin World: