user: Question: Which 2006 Cobra Starship song has work done of Guest vocals?
Columns: ['Year', 'Song', 'Work done', 'Artist(s)', 'Album']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2005.0, '"Sophomore Slump or Comeback of the Year"', 'Guest vocals', 'Fall Out Boy', 'From Under the Cork Tree']
SQL:

assistant: SELECT "Song" FROM "Table" WHERE "Work done" = 'Guest vocals' AND "Year" = 2006.0 AND "Artist(s)" = 'Cobra Starship';