Sentence:  Yuri Soloviev , Oleg Sokolov , Alexei Zhitkov , Lev Sokolov , Yuri Korneyev and Mr. Livshitz were the chief soloists , but everybody on stage <WSD>was</WSD> magnificent . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)