Alison Krauss
Alison Krauss is an undeniable country/bluegrass legend. And while much of her best-known work occurred before the 21st century, she contributed two indelible pieces of country music history after 2000. First, she performed and wrote on the juggernaut “O Brother, Where Art Thou?” soundtrack. Then she released “Raising Sand,” a collaboration album with Led Zeppelin frontman Robert Plant. Both works were huge successes, and both threw country into mainstream culture for good.