I too have that old recording with the Belgian horn player Monsieuer Francis ORVAL doing a lovely job with the Weber Horn Concertino.
Although from the sound of it he clearly used a modern valved horn, it has to be said that Weber did indeed write it for the old, 'natural' / valveless horn, for the simply reason that the valve hadn't been invented at that time!
The low notes that you mention are well within the compass of the valve horn and can be achieved with some determined 'lip and jaw work' on the hand-horn/ natural horn 'crooked' in the key of E.
The most grotesque ( if that is the right word) sounds are heard where Weber writes CHORDS; these are sounded by the player SINGING or humming the upper note and playing the lower one. if the intonation is OK, the arithmetical sum of the two frequencies yield a higher 'heard' note ( a bit like the upper harmonics of a violin string or maybe the 'aliquot' strings of a Bluethner piano). There is another arithmetical equation - the difference between the two pitches ( the played and the sung one) which yields a lower note. IN theory the end result ought to be a 4-part chord but in practice this rarely happens!
I have played this piece only once 'in concert' nearly 30 years ago, and on that occasion unwisely attempted to play it on a 'natural' / valveless horn. never again!
Although from the sound of it he clearly used a modern valved horn, it has to be said that Weber did indeed write it for the old, 'natural' / valveless horn, for the simply reason that the valve hadn't been invented at that time!
The low notes that you mention are well within the compass of the valve horn and can be achieved with some determined 'lip and jaw work' on the hand-horn/ natural horn 'crooked' in the key of E.
The most grotesque ( if that is the right word) sounds are heard where Weber writes CHORDS; these are sounded by the player SINGING or humming the upper note and playing the lower one. if the intonation is OK, the arithmetical sum of the two frequencies yield a higher 'heard' note ( a bit like the upper harmonics of a violin string or maybe the 'aliquot' strings of a Bluethner piano). There is another arithmetical equation - the difference between the two pitches ( the played and the sung one) which yields a lower note. IN theory the end result ought to be a 4-part chord but in practice this rarely happens!
I have played this piece only once 'in concert' nearly 30 years ago, and on that occasion unwisely attempted to play it on a 'natural' / valveless horn. never again!
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