user: ### NOW ANSWER:
Question: What was the peak date of Kelis's song?
Columns: ['Song', 'Featured artist', 'Main artist', 'Peak date', 'Peak']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['"Got to Get It"', 'Make It Hot', 'Sisqó', 'January 22, 2000', 39.0]
SQL:

assistant: SELECT "Peak date" FROM "Table" WHERE "Main artist" = 'Kelis';