Video footage of VELVET REVOLVER and ex-GUNS N' ROSES guitarist Slash performing the ALICE COOPER classic "School's Out" this past week during "Rock Week" on "American Idol", the annual reality show and singing competition, can be viewed below.Slash commented on his "American Idol" appearance in a new online post, saying, "The 'American Idol' adventure was quite an experience, to say the least. I did my best to change it up by mentoring the singers at the Roxy and I brought some great musicians to play with me, Tommy Clufetos on drums, Keri Kelli on guitar and Chris Chaney on bass. Matt Rhodes, the keyboard player from the 'American Idol' band also accompanied us and was indispensable in helping us navigate the key changes and edits that were necessary to perform the songs in the keys that the singers chose and in the time frame that fit the shows format etc. And all in just a couple hours. "Although the show itself was way out of my comfort zone initially, we definitely altered the show's routine, for better or worse. The show staff and crew were super-professional and sincerely went out of their way to make everything as painless and expeditious as possible. It wasn't a big spaz attack like on some TV productions. As important, if not more so, the singers were great to work with as well. Adam (who I was not scouting to sing in VELVET REVOLVER, by the way) was amazing, as was Alison, who was unceremoniously voted off prematurely, in my opinion. Danny and Kris were out of their element this week, but did the best they could under the circumstances. The judges, although unnecessarily harsh at times, were like rock stars themselves and Seacrest is the consumate professional, no matter what. Very interesting dynamics, more so in person than on TV. All in all, it was a good time. But the way I see it, as massive as 'American Idol' is, it could do with an infusion of rock and roll on a regular basis. Other than that, I have absolutely no complaints about the whole event." Previous stars who have mentored hopefuls on "American Idol" include Mariah Carey and Neil Diamond, while Jon Bon Jovi has mentored "Rock Week."