View the full lesson at The Phrygian Mode | JustinGuitar
Like Justin I’ve also read that Metallica uses the Phrygian scale a lot, but I’m not sure that’s the whole truth. A lot of their songs are based on the E minor tonal center, and you’ll often see both the F and the F# chords/notes. My interpretation is that they use different minor scales/modes within the same song, together with many chromatic runs.
E.g. the intro to Battery is in E Phrygian, but from the verse on I’d say it’s E natural minor with the occasional F5 chord that gets borrowed. TBH, a lot of this is up to personal interpretation.
I believe Wherever I May Roam has a Phrygian vibe going on throughout most of the song.