Here is the list of instruments compatible with Rock Band 4 | KitGuru
Rock Band & Guitar Hero Instrument Compatibility Guide | Audioholics
controllers - Do Guitar Hero peripherals work with Rock Band and vice versa? - Arqade
Nyko FrontMan guitar compatibility chart
Amazon.com: Wii Guitar Hero 5 Stand-Alone Guitar : Video Games
Guitar Hero publisher doesn't care about compatibility with Rock Band guitars – Destructoid
Amazon.com: Rock Band / Guitar Hero Official Microphone (Wii, PS3, Xbox 360) : Video Games
A slick solution to the instrument compatibility conundrum – Destructoid
Guitar Hero / Rock Band guitar compatibility matrix v2
Guitar Hero Live vs Rock Band 4 – which is best? – Tired Old Hack
Guitar Hero Live Wireless Guitar Controller 0000654 PS3 Xbox One PS4 Compatible | eBay
Guitar Hero/Rock Band Guitar Compatibility Guide - Pure Nintendo
Amazon.com: KYAYUGM Wireless Wii Guitar Compatible for Nintendo Wii, Supports for Guitar Hero and Rock Band Games. - BLACK(Rock Band 1 is Not Supported) : Video Games
Guitar Hero 5 - Wikipedia
New Guitar Hero costs $99, isn't backwards compatible | VG247
compatibility: did you guys know if guitar hero warriors of rock is compatible with the guitar hero 3 guitar? (see pic, Wii version) : r/ GuitarHero
Beatles Rock Band Instrument Compatibility Chart | WIRED
Official Guitar Hero/Rock Band Instrument Compatibility Chart | WIRED