Attack is one of two qualities associated with timbre (the other being flux). Attack refers to sounds made during the initial milliseconds after a note is sounded. According to Levitin, this brief first eyeblink or moment of sound is more like noise than music and appears to be critical to one’s ability to detect the timbre of an instrument. (Sternberg, Barbara, PhD. Music & the Brain. p 7-8. CA: Institute for Natural Resources, Home-Study #2320, 2009).