A signed sheet music (8½ x 11 inches) for the song Amber, autographed in-person by Tim Mahoney (guitar), Nick Hexum (vocals/guitar), Chad Sexton (drums), and Doug “SA” Martinez (vocals/percussion) of the band 311. In-Person Signature. Authentication: ACOA (AutographCOA) Certification Number: RA79968 Collector Note: Multi-signed sheet music from 311 is highly desirable, featuring key members of the band. Signed music memorabilia is rare and sought after by collectors and fans of alternative rock, especially for one of the band’s most popular songs. A display-ready, standout collectible from one of the most enduring and influential rock bands of the 1990s and beyond.