This is an excellent recording of the Mozart Requiem. It has a lot of interesting things about it, but the core is a first-rate performance of the familiar Süssmayr completion.
King's College Choir and The Academy Of Ancient Music have been world class performers for decades now (and probably for centuries before that, in the case of King's). They produce something really special here, I think. The vocal and instrumental forces are smaller than in some monumental performances, but they are still perfectly able to produce a powerful, thrilling sound - at the opening of the Dies Irae, for example, where my spine genuinely tingles. They also have the suppleness and flexibility to bring out the delicacy and intimacy of the work where appropriate. The four soloists are uniformly excellent and the acoustic of King's College Chapel helps to form the performance into a wonderful, cohesive whole. This one of the best interpretations I have heard, and that's really saying something, given the quality of the competition.
Disc 1 also includes "Realisations" by five other composers of sections of the Requiem which Mozart did not complete. You can program your CD player to have the whole Requiem with any or all of these substituted for the Süssmayr movements. I find these extremely interesting, and the notes on them are excellent. (Personally, though, I keep going back to the familiar version which is deeply ingrained in me.) In addition, there is a second CD of articles about aspects of the Requiem written by Cliff Eisen and read by Elin Manahan Thomas. It is interesting, but personally I'd much prefer these in written form and I don't go back to this part of the set - but that may just be me.
You simply cannot go wrong here, in my view. This is a superb performance, beautifully recorded, with scholarly additions, interesting notes and lovely presentation. Very warmly recommended.