user: Question: Who is the music-director for the song from the film Khaleja who had a co-singer of Hemachandra?
Columns: ['Year', 'Song Title', 'Film', 'Co - Singer', 'Music - Director']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2010.0, '"Amma Thale"', 'Puli (soundtrack)', 'Naresh Iyer', 'A. R. Rahman']
SQL:

assistant: SELECT "Music - Director" FROM "Table" WHERE "Co - Singer" = 'Hemachandra' AND "Film" = 'Khaleja';