CMT's What's Your 20? 20 Greatest Women counts down the 20 greatest female stars in country music in the past 20 years.
Alison is among the nominees for 20 Greatest Women. Cast your vote for your top five leading ladies to help determine their ranking on the show. Voting ends April 18.
See the women who've left an undeniable mark on country music history when CMT airs What's Your 20? 20 Greatest Women on May 7.