Question: Jeffrey Walker and Fat Mike, share which mutual occupation?

Related documents: [0]  [DOC] Jeffrey Walker (born 25 March 1969) is a bass guitarist, vocalist from Windle, St Helens, UK. He is best known for his work with death metal band Carcass for which he is also the main lyricist. Before Carcass, he played in the hardcore punk band Electro Hippies. After the demise of Carcass, he went on to form hard rock band Blackstar with two former Carcass bandmates. In some territories the band was called Blackstar Rising. [END] 
[1]  [DOC] Michael John Burkett (born January 31, 1967), also known as Fat Mike, is an American musician and producer. He is the bassist and lead vocalist for the punk rock band NOFX and the bassist for the punk rock supergroup cover band Me First and the Gimme Gimmes. He was also a temporary bassist for the band Against Me! [END]  
Answer: vocalist
vocalist