☕ Because arja is a specific local term (in this regard, Balinese), we can only make approximation to give global audience that have little knowledge about Bali. Because it involves a mix of dancing, singing, and drama, opera is the closest equivalence.

☕ Translation-wise, we can turn the most common way of introducing *difficult* phrase: put it in the brackets. This yields: Balinese opera (arja). Bon Gita Suara could be the troupe performing the show, so the entire phrase will be: With Balinese opera (arja) by Bon Gita Suara.

↪ For sure, if space allows, we can always put more explanatory word, such as Balinese-style opera (arja).

✸彡 REFERENCES
https://books.google.co.id/books?id=K-3RjnGxIB0C&pg=PA249&lp...
... for development and preservation Arja is often described as 'Balinese opera'.

https://books.google.co.id/books?id=Nmc2fMBx_y8C&pg=PA253&lp...
After I Gusti Ayu Karangasem refused, the arja, or Balinese opera, troupe hired to perform as part of the ceremonies in conjunction with the cremation ...