Sentence:  The crowd staged its own mad scene in salvos of cheers and applause and finally a standing ovation as Miss Sutherland took <WSD>curtain</WSD> call after curtain call following a fantastic `` Mad Scene '' created on her own and with the help of the composer and the other performers . 
Meaning of the word marked with <WSD> tags:  an appearance by actors or performers at the end of the concert or play in order to acknowledge the applause of the audience