[thunderbrick]

Dunno, but to me most orchestra/choir recordings sound congested and unintelligible; so little clarity, separation of voices, etc. 

But thanks to Goodwill recently I plucked two gems, both of university choirs.

Vespers 2014 from Millikin University, a live performance (complete with audience coughs) of wonderful depth and SQ.  Songs for the Christmas season mostly but no saccharine arrangements.  Reverential to the music and the performance.

https://www.amazon.com/Vespers-2014-Millikin-University-Choirs/dp/B01EU2VNBS/ref=sr_1_1?ie=UTF8&qid=1461783571&sr=8-1&keywords=Vespers+2014

The other is Great Hymns of Faith performed by the St. Olaf Choir, #E-2294.  Gives up just a bit to Vespers in clarity and the arrangements fall just a little behind Vespers, but both can be enjoyed any time of the year, as I have been doing these last weeks.

http://www.amazon.com/St-Olaf-Choir-Great-Hymns/dp/B000062TBU?ie=UTF8&keywords=Great%20Hymns%20of%20faith%20st%20olaf&qid=1461784101&ref_=sr_1_1&sr=8-1#customerReviews

[rockadanny]

I really enjoy this well recorded release. Vocals are very clear.

Morten Lauridsen: Lux Aeterna

[richidoo]

I love The Tallis Scholars. Everything is audiophile quality, always perfect intonation, and the lead soprano is awesome. This is a good one to start: