If you know Yiddish, all the better. If you do not, there is still much to appreciate. Glanville put together and sequenced the Yiddish cycle, choosing songs of Euro-Jewish composers both relatively known and more obscure. It is art song with some more in a typically minor key-Yiddish melodic mode than others. But all have interest.
Glanville and Knapp do a spirited job with the songs and many have great appeal if you hear them a number of times. It is a boon to those interested in a genre that does not always get much attention. Others may find it less essential. I found plenty to like here.