user: Question: What single was written by the artist cap D?
Columns: ['Year', 'Artist', 'Single', 'Other featured guests', 'Format']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2001.0, 'Athletic Mic League', 'Lyrictricity', '—', '12 Inch Vinyl']
SQL:

assistant: SELECT "Single" FROM "Table" WHERE "Artist" = 'cap D';