The sixth generation of country music continued to be influenced by other genres such as pop, rock, and R&B. Richard Marx crossed over with his Days in Avalon album, which features five country songs and several singers and musicians. Alison Krauss sang background vocals to Marx's single "Straight from My Heart." Also, Bon Jovi had a hit single, "Who Says You Can't Go Home", with Jennifer Nettles of Sugarland. Kid Rock's collaboration with Sheryl Crow, "Picture," was a major crossover hit in 2001 and began Kid Rock's transition from hard rock to a country-rock hybrid that would later produce another major crossover hit, 2008's "All Summer Long." (Crow would also cross over into country with her hit "Easy.") Darius Rucker, former frontman for the 1990s pop-rock band Hootie & the Blowfish, began a country solo career in the late 2000s, one that to date has produced three albums and several hits on both the country charts and the Billboard Hot 100. Singer-songwriter Unknown Hinson became famous for his appearance in the Charlotte television show Wild, Wild, South, after which Hinson started his own band and toured in southern states. Other rock stars who featured a country song on their albums were Don Henley and Poison.
In 2005, country singer Carrie Underwood rose to fame as the winner of the fourth season of American Idol and has since become one of the most prominent recording artists of 2006 through 2016, with worldwide sales of more than 65 million records and seven Grammy Awards. With her first single, "Inside Your Heaven", Underwood became the only solo country artist to have a #1 hit on the Billboard Hot 100 chart in the 2000–2009 decade and also broke Billboard chart history as the first country music artist ever to debut at No. 1 on the Hot 100. Underwood's debut album, Some Hearts, became the best-selling solo female debut album in country music history, the fastest-selling debut country album in the history of the SoundScan era and the best-selling country album of the last 10 years, being ranked by Billboard as the #1 Country Album of the 2000–2009 decade. She has also become the female country artist with the most number one hits on the Billboard Hot Country Songs chart in the Nielsen SoundScan era (1991–present), having 14 No. 1s and breaking her own Guinness Book record of ten. In 2007, Underwood won the Grammy Award for Best New Artist, becoming only the second Country artist in history (and the first in a decade) to win it. She also made history by becoming the seventh woman to win Entertainer of the Year at the Academy of Country Music Awards, and the first woman in history to win the award twice, as well as twice consecutively. Time has listed Underwood as one of the 100 most influential people in the world. In 2016, Underwood topped the Country Airplay chart for the 15th time, becoming the female artist with most number ones on that chart.
During the early 1980s, country artists continued to see their records perform well on the pop charts. Willie Nelson and Juice Newton each had two songs in the top 5 of the Billboard Hot 100 in the early eighties: Nelson charted "Always on My Mind" (No. 5, 1982) and "To All the Girls I've Loved Before" (No. 5, 1984, a duet with Julio Iglesias), and Newton achieved success with "Queen of Hearts" (No. 2, 1981) and "Angel of the Morning" (No. 4, 1981). Four country songs topped the Billboard Hot 100 in the 1980s: "Lady" by Kenny Rogers, from the late fall of 1980; "9 to 5" by Dolly Parton, "I Love a Rainy Night" by Eddie Rabbitt (these two back-to-back at the top in early 1981); and "Islands in the Stream", a duet by Dolly Parton and Kenny Rogers in 1983, a pop-country crossover hit written by Barry, Robin, and Maurice Gibb of the Bee Gees. Newton's "Queen of Hearts" almost reached No. 1, but was kept out of the spot by the pop ballad juggernaut "Endless Love" by Diana Ross and Lionel Richie. The move of country music toward neotraditional styles led to a marked decline in country/pop crossovers in the late 1980s, and only one song in that period—Roy Orbison's "You Got It", from 1989—made the top 10 of both the Billboard Hot Country Singles" and Hot 100 charts, due largely to a revival of interest in Orbison after his sudden death. The only song with substantial country airplay to reach number one on the pop charts in the late 1980s was "At This Moment" by Billy Vera and the Beaters, an R&B song with slide guitar embellishment that appeared at number 42 on the country charts from minor crossover airplay. The record-setting, multi-platinum group Alabama was named Artist of the Decade for the 1980s by the Academy of Country Music.
Sometimes it takes an ‘American Woman’ to break into the US charts, and that’s what Canadian powerhouse rock group, The Guess Who did in 1970, being the first Canadian group to have a US chart topper since 1954. Powered by the soulful vocals of Burton Cummings and Randy Bachman’s driving guitar and sardonic songwriter, the Winnipeg-based band found international success throughout the 60s and 70s, until disbanding when Bachman left the group and went on to form the hugely successful, Bachman-Turner Overdrive, with their hit single ‘You Ain’t Seen Nothing Yet’.