Instruct: Classify a given review into positive or negative sentiment.
Query: Musicianship, but no sparkle

Mr. Hampson spends as much care and and craft on these songs as he would on lieder, but the results were disappointing to me. The zest and sparkle that I expect from Viennese operetta is just not there. So, my vote is for less restraint and musicianship and more "joyful abandon" in performance.