Robert Plant, an English singer, songwriter, and musician, best known as the lead singer and lyricist of the rock band Led Zeppelin. A powerful and wide vocal range (particularly evident in his high-pitched vocals) has given him a successful singing career spanning over 50 years. Plant is regarded as one of the greatest singers in the history of rock and roll. In 2006, Heavy Metal magazine Hit Parader named Plant the "Greatest Metal Vocalist of All Time". In 2009, Plant was voted "the greatest voice in rock" in a poll conducted by Planet Rock. In 2008, Rolling Stone editors ranked him number 15 on their list of the 100 best singers of all time. In 2011, Rolling Stone readers ranked Plant the greatest of all lead singer.
Sheryl Crow, A nine-time GRAMMY AWARD recipient, Sheryl Crow is an American music icon. Her nine studio albums have sold 35 million copies worldwide; seven of them charted in the Top 10 and five were certified for Multi-Platinum sales. In addition to such No. 1 hits as “All I Wanna Do,” “Soak Up the Sun” and “The First Cut Is the Deepest,” Crow has lofted 40 singles into the Billboard Hot 100, Adult Top 40, Adult Contemporary, Mainstream Top 40 and Hot Country Songs charts, with more No. 1 singles in the Triple A listings than any other female artist.