Especially bands like Metallica. With their obvious world-famous popularity, there are just so many different versions and tunings, and god, it took me ages to finally get “Blackened” right. The worst is when 1 song is transcribed in 2 different tunings. Took me forever to realise songs like “A New Level” by Pantera and “The Thing That Should Not Be” by Metallica are NOT in Drop D (Thanks to Youtube). On top of that, according to the Japanese guitar book, “Sad But True” by Metallica is played by a 7 string guitar! Pretty confusing. So let’s not even go there about Dimebag Darrell’s tunings.