How would I get the sound needed for these songs

Intro lead for burnt offerings by Testament
The beginning of the my friend of misery solo by Metallica

Is it a synth pedal?
You like IHOP??? Socialist!!!
I guess what you mean are guitar harmonies.
You need 2 guitarists for that.

If you want to do it alone: Digitech Harmony Man.
Quote by eatfresh1736
The beginning of my friend of misery is just a bass. Believe it or not, they actually let newsted play bass on that album

Not the beginning of the song, the beginning of the solo.
You like IHOP??? Socialist!!!