user: Question: For which singers was Alangudi Somu the lyricist?
Columns: ['Track #', 'Song', 'Singers', 'Picturization', 'Length', 'Lyricist']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Ellappugazhum"', 'A. R. Rahman', 'Vijay', '5:31', 'Vaali']
SQL:

assistant: SELECT "Singers" FROM "Table" WHERE "Lyricist" = 'Alangudi Somu';