All right, daggone it--I'll do it! Soprano! There!!
I was gonna guess that last night, but I couldn't for the life of me figure out what that has to do with third. I still can't. Acc'g. to the link, the third note is la.
'Sol', or even 'so' to make it fit (they aren't solpranos, after all), is the fifth note. And ...and...argh, for every argument I can think of why it might be that, I can think of at least one reason why it mightn't!