Dance journal databases are specialized - they're by authorities ("peer reviewed") and have special ways to get at art topics.
Magazine and Newspaper Indexes
Nexis Uni (formerly LexisNexis Academic): Additional newspaper/magazine articles on your topic
Academic OneFile: Search across magazine, journals, and books on your topic
JSTOR: Search for academic journal articles on your topics (limit to "Performing Arts" subject)
MLA Bibliography - massive language-interests db, includes dance topics when related to theater
eHRAF - World Cultures -
~ collection of thousands of books and articles on cultures from all regions of the world; provides information on particular cultures, ethnic groups, their beliefs, political structure, and cultural traditions.
Frequently newspaper accounts can be primary sources for performances and other reception documentation. Also good for interviews and biographical/obituary accounts.
America's Newspapers - search American newspapers by region of the country or individual newspaper. Great for seeing how an art show was reviewed in rural America.
Historic - newspaper accounts can be primary sources for exhibitions, reception documentation, museum collection history, etc. Also good for patronage verification and biographical/obituary accounts. Both pdf scans of the actual column.
Times Digital Archive - the Times (London), 1785-1985
New York Times Digital Index - 1851 until three years ago.
For a full list of full-text newspapers, see the Newspapers Database List