I just found this in a second hand app in Spain… a console-less guitar hero? It surely isn't official but I searched on google and can't find anything about this LOL :
Guitar Hero' Now Available in App Store - MacRumors
Activision launches Guitar Hero Live for iOS with optional wireless guitar controller bundles
Guitar Hero (iOS) | WikiHero | Fandom
Anime Guitar Hero APK for Android Download
Guitar Hero for iPhone - Download
Guitar Hero Mobile series - Wikipedia
Rock Hero - Guitar Music Game - Apps on Google Play
Guitar Band - Battle Hero on the App Store
FarmVille, Guitar Hero have a date with the App Store | Macworld
Guitar Hero App Gets New Track Packs
15 Years Ago: 'Guitar Hero' Rocks the Gaming World
Guitar Hero: iOS on Behance
Guitar Hero App 🎸 by Amelia Nurvita🐻 for Vektora on Dribbble
Guitar Hero Games With Custom Songs – FuelRocks
App Insights: Guide Guitar Hero 3 New | Apptopia
Guitar Hero Now Available on App Store | GameZone
No More Heroes: Whatever happened to the 'Guitar Hero' and 'Rock Band' games?
Guitar Hero Live's companion app is STILL dysfunctional. – yBaX |> PLAY
Slash Launches Guitar Hero Ripoff iPhone App - RouteNote Blog