Being an audiophile I'm fussy about song versions. Some song versions being stellar performances and others butchered or not so go good. This is because a lot of bands the songs are improve so the song is never played exactly the same way twice.
This song 'War Pigs' is a studio version and it is the premier version of the song. All other live versions butcher the song because it was produced in studio using what I believe is called over dubbing, can't be done live. There, I got that off my chest, I feel better now.
