How many themes have the original artist of Judy Garland?
CREATE TABLE table_15796100_1 (
    theme VARCHAR,
    original_artist VARCHAR
)
SELECT COUNT(theme) FROM table_15796100_1 WHERE original_artist = "Judy Garland"
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: How many themes have the original artist of Judy Garland? ### Input: CREATE TABLE table_15796100_1 (
    theme VARCHAR,
    original_artist VARCHAR
) ### Response: SELECT COUNT(theme) FROM table_15796100_1 WHERE original_artist = "Judy Garland"