Voodoo Child (Slight Return) opens with the most iconic wah-wah guitar intro in rock history and features some of Hendrix's most aggressive and physically expressive soloing. The track was recorded in one session and released almost as an afterthought, yet it became one of his most enduring recordings. Hendrix treats the whammy bar, wah pedal, and feedback as equal melodic tools alongside his fingers, creating an entirely new vocabulary for the electric guitar.

Reference:

Wikipedia: Voodoo Child (Slight Return)

https://en.wikipedia.org/wiki/Voodoo_Child_(Slight_Return)