Cellist Mstislav Rostropovich and soprano Galina Vishnevskaya met each other during her tour in Czechoslovakia, and after Rostropovich (Slava for friends) courted her. She already had built quite a career, and was the leading star of the famous Bolshoi Theatre in Moscow. After a short but dramatic courtship, they married.
And stayed together for the rest of their lives (or rather Slava’s, he died in 2007). Vishnevskaya later said they were able to stay together because they never saw each other as performers. In private they were a couple outside of the world of music. Even when the Sovjet president Nikolai Bulganin tried to seduce her, she stayed true. Bulganin even cancelled her tour abroad. The tour was allowed by Secretary Nikita Khrushchev after he fell from power a year later.