What tuning does bands like Metallica, Def Leppard, Guns and Roses and Heavy Metal bands use?

Question

Most Heavy Metal bands tune down 1/2 step because its easier for the vocalist, easier to bend strings, and the lower pitch sound is appealing to the listener.

Metal bands like Black Sabbath, Arch Enemy, System of A Down can tune down to C# or C tuning, or drop D tuning, drop C tuning, etc. which gives an appealing lower pitch sound to the listener.

Answer 1

Generally, guitarists in any kind of pop related music, be it heavy metal, classic rock, traditional jazz, folk music etc., will use a standard E-A-D-G-B-E tuning, although some tunes like "Suite Judy Blue Eyes," as recorded by Crosby, Stills and Nash, will employ a DADGAD tuning