user: Question: Which Nominee has an Award Ceremony of Tony Award, and a Category of the Best Performance by a Leading Actor in a Musical?
Columns: ['Year', 'Award Ceremony', 'Category', 'Nominee', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1979.0, 'Tony Award', 'Best Musical', 'Best Musical', 'Won']
SQL:

assistant: SELECT "Nominee" FROM "Table" WHERE "Award Ceremony" = 'Tony Award' AND "Category" = 'Best Performance by a Leading Actor in a Musical';