Saul Hudson (born July 23, 1965), better known by his stage name Slash, is a British-born American rock guitarist who gained fame with the band Guns N' Roses, and has also performed as part of Slash's Snakepit and Velvet Revolver, and as a solo performer. 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.
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Promotional photo featuring Phineas, Ferb, and Doofenshmirtz (2nd Dimension) rocking out with Slash.