14. "War Pigs" by Black Sabbath
The album Paranoid is essential listening to anyone that's ever gotten into hard rock or metal, and I listened to it fairly early on in my music-exploring days. As much as I loved hits like "Paranoid" and "Iron man," this song was my favorite off the album. Such an awesome opener! It may be overplayed and it may sound dated compared to what's hard 'n heavy now, but it still packs a punch and is still a great song.