Saul Hudson (born July 23, 1965), better known as Slash, is an English-American guitarist. He is best known as the lead guitarist of the band Guns N' Roses. Slash co-wrote and performed the song "Kick It Up A Notch" for Phineas and Ferb the Movie: Across the 2nd Dimension, and also appears in both live-action and animated forms in the music video for the song.