All About Britney Spears

i need help finding music can you help?

im looking for lists of artists under the categories of rock techno and country...btw who is the artists on that one song on mtv where those females holding those hearts cause it never showed the artist name or nothing

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1. Muse, Dixie Chicks, Killers, Shania Twain, Carrie Underwood, Tim Mcgraw, Keith Urban, Gretchen Wilson
2. Rock: Killswitch Engage, Korn, Rise Against, ShineDown, Audioslave, Incubus, Taking Back Sunday, Three Days Grace Techno: DJ Icey, DJ Irene, Paul Oakenfold, Darude Country: sorry, not my expertise...