Halka (Halina) is an opera by the Polish composer Stanisław Moniuszko. The libretto was by Wlodzimierz Wolski (1824–1882), a young Warsaw poet with radical social views. It is part of the canon of Polish national operas.

The first performance of the two-act version was in Vilnius on 1 January 1848. This was staged in Vilnius on 28 February 1854. A four-act version was performed in Warsaw on 1 January 1858. The opera was subsequently produced in the United States, Canada, Mexico, Japan, Turkey, Russia and Cuba.

The opera has recently been staged and directed by Krzysztof Jasiński, with musical direction by Wojciech Michniewski, choreography by Emil Wesolowski, with the stage movement devised by Anatol Kocydlowski with The Ballet and Orchestra of the Opera Krakowska. The opera has included soloists, such as Ewa Biegas and Maria Mitrosz alternating in the title role, Maciej Komander and Tomasz Kuk as Jontek, Przemyslaw Firek and Janusz Borowicz as the Esquire, Andrzej Biegun and Andrzej Szkurhan as Janusz, and Edyta Piasecka and Joanna Tylkowska as Zofia.

Nusrat Fateh Ali Khan (Punjabi: نصرت فتح علی خان (Shahmukhī)) (October 13, 1948 – August 16, 1997), a world-renowned Pakistani musician, was primarily a singer of Qawwali, the devotional music of the Sufis (a mystical tradition within Islam). Considered one of the greatest singers ever recorded, he possessed a six-octave vocal range^{[citation needed]} and could perform at a high level of intensity for several hours. Extending the 600-year old Qawwali tradition of his family, Khan is widely credited with introducing Sufi music to international audiences. He was popularly known as "Shahenshah-e-Qawwali", meaning "The King of Kings of Qawwali".

Born in Faisalabad, Pakistan, Khan had his first public performance at age of 16, at his father's chelum. He officially became the head of the family qawwali party in 1971, and was signed by Oriental Star Agencies (OSA), Birmingham, U.K., in the early 1980s. In subsequent years, Khan released movie scores and albums for various labels in Pakistan, Europe, Japan and the U.S. He engaged in collaborations and experiments with Western artists, becoming a well-known world music artist in the process. He toured extensively, performing in over 40 countries.