Question: Daniel Johns and Justin Currie both did what in their respective music groups?
Related documents: [0]  [DOC] Daniel Paul Johns (born 22 April 1979) is an Australian musician, singer, and songwriter. Best known as the former front man of the rock band Silverchair, Johns is also one half of The Dissociatives with Paul Mac and, in 2007, was ranked at number 18 on "Rolling Stone"' s list of The 25 Most Under-rated Guitarists. [END] 
[1]  [DOC] Justin Robert Currie (born 11 December 1964) is a Scottish singer and songwriter, best known as a founding member of the band Del Amitri and, along with Iain Harvie, is one of only two members of the group to be present throughout its entire existence. [END] 
Answer: 
singer and songwriter
singer and songwriter