Re: 'Heaviest' songs in standard tuning?
A lot of Rammstein actually is in standard E tuning.
Also a lot of Judas Priest, and quite some Motörhead, too.
If E flat is fine, there's a lot more Motörhead to play :1:
Of course AC/DC plays a lot in E standard and E flat, too. Don't tell me "Whole lotta Rosie" doesn't rock...
Shinedown has some E flat songs, too.