Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_23429629_4 (semi_final VARCHAR, act VARCHAR)
### Question:
During the act, Playing on Glasses, what was the semi-final?
### Answer:
SELECT semi_final FROM table_23429629_4 WHERE act = "Playing on Glasses"