user: Question: What co-singer has Sukhwinder Singh as the composer?
Columns: ['Year', 'Song', 'Film', 'Co-Singer', 'Composer', 'Lyricist']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2013.0, 'Hridoy Aamar Nache Re', 'Shunyo Awnko', 'None', 'Rabindranath Tagore', 'Rabindranath Tagore']
SQL:

assistant: SELECT "Co-Singer" FROM "Table" WHERE "Composer" = 'Sukhwinder Singh';