Question: Are Andrew Stockdale and Sully Erna both vocalists?
Related documents: [0]  [DOC] Salvatore Paul "Sully" Erna Jr. (born February 7, 1968) is the American vocalist and guitarist for the American hard rock band Godsmack. He is also a harmonica player, percussionist and pianist, performing these on albums and at live shows. He was ranked 47th in the Top 100 Heavy Metal Vocalists by "Hit Parader". [END] 
[1]  [DOC] Andrew James Stockdale (born 20 July 1976) is an Australian rock musician, singer and songwriter best known as the lead vocalist, lead guitarist and only mainstay member of the rock band Wolfmother, which formed in 2000. In 2007, alongside his Wolfmother bandmates, he won 'Songwriter of the Year' at the APRA Awards. Aside from his work with Wolfmother, Stockdale was featured on the 2010 single "By the Sword" by Slash. [END] 
Answer: 
yes
yes