Along with the improvisation, many of these tutors discuss articulation. Francesco Rognoni in 1620 describes the tonguing as the most important part of producing “a good and beautiful effect in playing wind instruments, and principally the cornett” (which of course had a very similar role to the trombone). The treatises discuss the various strengths of consonants from “le” through “de” to “te”. But the focus of the text is for playing rapid notes “similar to the gorgia of the human voice” with “soft and smooth” double tonguing (“lingua riversa”) using “le re le re”. This is opposed to using “te che te che,” which is described as “harsh, barbarous and displeasing”. The natural ‘pairing’ of notes these articulations provide is similar to the instructions for string players who are instructed to slur (“lireggiar”) pairs of eighth notes with one bow stroke per quarter beat.