When Guns N' Roses was in New Jersey last week during their concert tour, GNR guitarist Slash took some time out from the band and went into New York City to surprise the cast of "School of Rock" during one of their rehearsal sessions.

Slash secretly walked on stage while the group was practicing "Sweet Child O' Mine"

At the end of the song, check out the little singer's face when he realized it was Slash jamming with them.

Slash also hung around to play "Paradise City" with the kids

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