what was the first single to earn a chart position ?
CREATE TABLE table_203_661 (
    id number,
    "year" number,
    "single" text,
    "peak chart positions\nus mod" number,
    "peak chart positions\nuk" number,
    "album" text
)
SELECT "single" FROM table_203_661 WHERE NOT "peak chart positions\nus mod" IS NULL ORDER BY "year" LIMIT 1
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what was the first single to earn a chart position ? ### Input: CREATE TABLE table_203_661 (
    id number,
    "year" number,
    "single" text,
    "peak chart positions\nus mod" number,
    "peak chart positions\nuk" number,
    "album" text
) ### Response: SELECT "single" FROM table_203_661 WHERE NOT "peak chart positions\nus mod" IS NULL ORDER BY "year" LIMIT 1