I'm in agreement with the other reviewer who says he can't tell Gail Russell from a woman who ostensibly replaced her. If that was Sabu's wife Harry Cohn must have cloned Gail Russell to finish the film.
Gail who had an exotic look to her and played many an exotic role is an Indian princess from newly freed India. A point was made of that during the film, nice they acknowledged contemporary events. She's betrothed to a neighboring prince Turhan Bey who has decided to break an ancient taboo and hunt in a forbidden jungle.
The local natives live in harmony with the animals and I assume are on Vegan diets. Also living in the village is the last descendant of the previous dynasty before Turhan Bey took over the kingdom and that would be Sabu.
Song Of India has a nice charm of its own. I recall seeing this film over 50 years ago as a lad and I have to say I was as captivated then as now. For a B picture the jungle footage was well integrated with the studio shot stuff.
Needless to say bad things start happening when Bey and his party enter Sabu's world. A dynastic power struggle that Bey never expected occurs with the prize a kingdom and the beautiful Gail Russell.