12 Quoniam Tu solus sanctus

[thehornconcertoking]

The horn is actually a corno da caccia, pitched in F. You can tell because of a few things: the valves employed, the lead pipe tuner, and that the corno player is not inserting his hand into the bell. This instrument was performed by both trumpeters and hornists; in this case you can tell it's a horn player by the setting of the embouchure. I'm not sure if my German translations are any good, but I think @Robert010 said his name is Ralf Gotz, solo horn of the Gewandhaus Orchestra. 

[Arsenate22]

The singer's musicianship far outpaces his vocal technique. The phrasing, accents etc... are all lovely. The singing, though, is often laboured and he really reaches for some of the high notes -they become disconnected from the line.

Really enjoyable performance overall, though.

[selaromyar]

This is by far the best interpretation that I have hear in YouTube. In matter of fact through out my musical career! beautiful intonations, timber from the bass, the horn in D is not over powering, as well as the two bassoons and organ. It is like a well oiled machine, just like clock work. If you notice it is a simple form that Bach perfected, and that is a Trio Sonata (baroque definition) voice, horn, and continuo (bassons and organ). Mazaltov!!

[rhythmgorilla]

I love the violinist with her finger in her ear!

[laertes160]

The singer made an interesting and effective departure from the score at approx. 3:06. (I am using Schirmer. That would be measure # 83.) The singer uses an embellishment that deepens the descent to the E# (F) at the start of meas. 85. A very interesting change - bravo.

[TheAndrewSchneider]

Rather interesting that there is a contrabassoon visible.

[noacantin]

Un peu de français dans ce Babel.

[Robert01O]

Wunderschön von Ralf Götz, Solohornist des Gewandhausorchesters, geblasen!

[rgeraredz]

There's just something not right about about a 3-way between 2 bassoons and a horn. Only Bach could pull this off.

[beaver6d9]

corno da caccia = ftl

[papageno88]

What's wrong with you? This is some of the best writing for the Horn on the rep.

[1337evan]

is that a single F alto Horn he's playing on? It seems a little small to be a regular double horn or even a single.

[bradhorn14]

no prob a blfat with an F attachment for the trigger to compensate

[Hossetur]

my guess: custom made single horn in B (mass in B) :)