Table: sweeney_todd_awards
Columns: year
award_ceremony
category
nominee
result

Question: Which Year has a Category of best performance by a leading actress in a musical?
SQL: SELECT MAX("year") FROM sweeney_todd_awards WHERE "category" = 'best performance by a leading actress in a musical'

Question: Which Award Ceremony has a Result of nominated, and a Category of best revival of a musical?
SQL: SELECT "award_ceremony" FROM sweeney_todd_awards WHERE "result" = 'nominated' AND "category" = 'best revival of a musical'