Answer:
timbre
Step-by-step explanation:
Timbre is a psychoacoustical aspect of sound i.e., the sound being received by a person gets interpreted differently by different people. The timbre denotes the tone color or tone quality of a musical note, sound or tone.
Two different instruments playing the same note at the same amplitude and frequency will sound different. Timbre is also known as the texture of sound
Here, when Lanny's fans describe his voice as silky sweet voice they are describing the texture of sound which is the timbre.