Instruct: Classify Amazon reviews into positive or negative sentiment
Query: FLAGSTAD AT 60 ------- STILL A POWERHOUSE OF SOUND

Kirsten Flagstad was incredible. She emerged from retirement to sing this New York concert in March of 1955, and was only a few months shy of her 60th birthday. Past her vocal prime? If this is "past prime", it's singing that sopranos half her age would have gladly settled for. Every item here is beautifully done, with Flagstad unfurling her mammoth voice over the orchestra. No details needed here, really. The only subsequent soprano capable of this kind of singing was Birgit Nilsson, who also at age 60 was still going strong. These two Nordic giants were truly daughters of the Vikings!!!! Amazingly reasonable price for this disc. If you want to hear singing on a magnitude completely extinct today, buy this disc. Sound and sonics are perfectly acceptable.