user: Question: Which level has Marvin Gaye as artist 1 and David Bowie as artist 2?
Columns: ['Song 1 title', 'Artist 1', 'Song 2 title', 'Artist 2', 'Mix artist', 'Guitar part?', 'Level']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['" Ace of Spades "', 'Motörhead', '"Groundhog"', 'Noisia', 'FreeStyleGames', 'Yes', 'Born To Rock']
SQL:

assistant: SELECT "Level" FROM "Table" WHERE "Artist 1" = 'Marvin Gaye' AND "Artist 2" = 'David Bowie';