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No, Tantric is a post-grunge, hard rock band.
Yes, Coldplay is a rock band.
More specifically, they could be classified as an Alternative Rock band, with their more recent work additionally labelled as post-Britpop.
Sleeping with Sirens' music has variously been described as punk, post hard core, screamo, and pop rock.
Modern Warfare 2
alternative rock
garage rock revival
post-punk revival accoding to wikipedia