In 2006, heavy metal magazine Hit Parader named Plant #1 on their list of the 100 Greatest Metal Vocalists of All-Time.
Since 2007, Plant has been recording and performing with bluegrass star Alison Krauss. A duet album, Raising Sand, was released on 23 October 2007. On 8 February 2009, Plant and Krauss won Grammy Awards for Album of the Year, Record of the Year, Pop Collaboration with Vocals, Country Collaboration with Vocals, and Contemporary Folk/Americana Album.
In 2008, Rolling Stone named Plant as number 15 on their list of the 100 Greatest Singers of All-Time, and in 2009, he was voted the "greatest voice in rock" in a poll conducted by Planet Rock.