See notes below
Sumac was not a Peruvian princess - that was an invention “by Hollywood” according to Wikipedia (who also report the Peruvian government supported her claim), Wikipedia also report her parents were mestizos (of mixed race). Nevertheless, her vocal ability is not in doubt as there are recordings to prove it (but not this one).It is one of the most famous arias but I decided in the first part to have three good singers who you don't normally associate with the aria. If you don't know the fabulous Yma Sumac, she was a vocally self taught Peruvian princess with a staggering 4 and a half octave range. She was the most famous mid century exotica singer but made some impressive opera aria recordings as well. The next part of this contest will pit Callas against Callas as no one can compete against her with this group;-)
Although it seems silvery and somewhat light on records, those who heard her live speak of exceptional power. Raisa was considered a dramatic soprano, while Giannini a spinto. I have also read that Raisa declined by the 1930s, which is when this recording is from. That may account for the issues with diction. She was at her best in the 1910s and 1920s.Not sure what Sumac is doing, but her vocal production is very odd and I simply don't like it, so she goes out first.
Despite Raisa's slightly odd pronunciation, I had no problem picking her though. As Woodduck says, this is a prayer and Raisa addresses her God, whilst Giannini is definitely singing to the gallery. I actually also preferred her silvery timbre to Giannini's richer sound too. Raisa gets my vote.