I know I’ve posted this before...but I was listening to it again last night and thought I’d repost it. Sergei Rachmaninov’s “Vocalise” sung by Russian Tatar operatic soprano Aida Garifullina.
That's a remarkably firm and secure voice in both tone and the trills. Technically I find close to on a par with Moffo's version which I would give the edge to emotionally. The troubling thing is that I was going to comment that it is superior to the version I've seen you post on several occasions in the past, until realizing it's the same artist. Is it a different performance?