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Story summary
- Billboard released its 50 Best Rock Bands list, highlighting the genre's diversity.
- Metallica ranks No. 12 and is noted for evolving from speed thrashers to a mainstream sound.
- Black Sabbath ranks No. 9 and is credited with transforming rock music.
- Paramore is the only 21st-century band on the list, blending rock and pop.
- Billboard notes flexible criteria for 'rock' and invites fans to vote.
