SELECT COUNT(*) FROM table_204_613 WHERE "album" = 'non-album singles'
tell me the number of non album singles .
CREATE TABLE table_204_613 (
    id number,
    "title" text,
    "year" number,
    "peak chart positions\nus" number,
    "peak chart positions\nus\nr&b" number,
    "peak chart positions\nus\nrap" number,
    "album" text
)