An 8½x11 inch sheet music copy of Intergalactic (1998), signed in-person by Ad-Rock (Adam Keefe Horovitz). This collectible features a prominent autograph, perfect for framing or adding to a curated collection of music memorabilia. Signed in person by Ad-Rock and certified authentic by JSA. Item Type: Sheet Music Autograph: In-person Authentication: JSA [James Spence Authentication] Certification Number: AP57663 Collector Notes: Ideal for collectors of hip-hop and music history memorabilia, this signed Intergalactic (1998) sheet music comes with a JSA [James Spence Authentication] COA, guaranteeing authenticity and value for years to come.