incisivity

noun /ɪnsaɪˈsaɪvɪtɪ,ɪnsaɪˈsɪvɪtɪ/

The quality of being incisive; penetrating trenchancy; incisiveness.

The remarkable tenor qualities of De Muro, especially in the ardent incisivity of his high register, the manly warmth of his tone and his exceptional breathing (Fiato), as well as his uncommon qualities of interpretation, capable of violent dramatic impulse and of lyric inflexion, remain documented in the excerpts he recorded of “Isabeau” in 1912, a testimony, at least auditive, of what was his legendary Folco.