Lip Trill
A lip trill is a rapid oscillation between neighboring harmonics - used primarily for whole-step trills from second-line G up approximately an octave. Lip trills are possible both lower and higher, but much lower than G and the harmonics are too far apart for a whole step, and much higher and harmonics are too narrow. Many books give fingering charts for lip trills, but as with all things on the double horn, there are options. A good rule of thumb, however, is for a trill from G-A, use 1 & 3, on the F horn, A♭-B♭, use 2 & 3, etc. From third-space C♯-D♯, use 2 & 3 on the B♭ horn, up to open B♭ horn for f-g. In his book "The Horn", Barry Tuckwell also gives a fingering chart of possible 'faux' 1/2 step lip trills.
Read more about this topic: List Of Horn Techniques
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