Classical Singer: Monthly magazine for singers and students of singing. Contains, news items, listings of contests, feature articles.
Journal of Singing: Official journal of the National Association of Teachers of Singing, Inc. Feature articles plus reviews of books, scores, and recordings.
Journal of Voice: Official Journal of the Voice Foundation and the International Association of Phonosurgery. Contains articles about performing as well as many highly technical and/or medical articles. Available online.
Opera News: Published by the Metropolitan Opera Guild, Inc. Available online and in print. Information about upcoming Met broadcasts is available at the free site Opera News Online.
Opera: London-based journal with worldwide coverage: the current scene, upcoming events, reviews.
Other journals that offer articles and reviews of interest to singers:
Down Beat: jazz
Early Music and Early Music America: early music
Opernwelt: news about opera worldwide. In German.
Cambridge Opera Journal and Opera Quarterly: scholarly articles about opera.