Hillary Scott, Kimberly Perry and Zac Brown are just a few of the names that help make up some of country's most beloved vocal groups -- and they're all contenders for Vocal Group of the Year at the 2015 CMA Awards.

Little Big Town are the reigning Vocal Group of the Year champs. They've been named the top group in country music three years in a row -- but they face some major competition from other talented artists this year. Lady Antebellum, meanwhile, are coming off of their successful and highly attended Wheels Up 2015 Tour. They won Vocal Group of the Year for three years straight from 2009-2011; will they begin another winning streak this year?

Rascal Flatts won this award six years in a row, until Lady A broke their streak, and they're seasoned veterans in the country music field. But sibling trio the Band Perry are hoping their engaging live show will help finally make 2015 their winning year; they've been nominated in this category every year since 2010.

Finally, the Zac Brown Band continue to make an impact, especially with their newest release, Jekyll + Hyde.

Who do you think should take home Vocal Group of the Year at the 2015 CMA Awards? Vote as often as once per hour through 11:59PM ET on Oct. 31. We’ll tabulate the results and use them for our 2015 CMA Awards winners predictions the week before the show.

The 2015 CMA Awards are scheduled to air live from Nashville on Nov. 4 at 8PM ET on ABC. For the eighth year, Brad Paisley and Carrie Underwood have been named as the hosts.

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