user: Question: During the act, Playing on Glasses, what was the semi-final?
Columns: ['Place came', 'Artist', 'Category', 'Act', 'Semi-final', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1st Place (Won the Series)', 'Erlend Bratland', 'Singing', 'Performance of "Lost" by Anouk', "5 (public's choice)", 'Winner']
SQL:

assistant: SELECT "Semi-final" FROM "Table" WHERE "Act" = 'Playing on Glasses';