Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Obvious enthusiasm for his repertoire!

Lyric tenor Richard Heard, accompanied on piano by Pamela Howland, performs with a fresh, clear sound and an obvious enthusiasm for his repertoire, which features diverse composers including William Grant Still, John Work, Margaret Bonds, Coleridge-Taylor Perkinson, H.T. Burleigh and W.C. Handy.