Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: From a violist's point of view

I have played the viola for 10 years now and have been given opprotunities to hear a broad variety of artists in the string realm. That one is able to play any one of Paganini's Caprices competantly such that there is adaquet sound from the instrument without scratching or losing contact in the upper extremes says more than words are able to about a player's abilities. Paganini's Caprices are lively pieces that challenge a string player's dexterity and quickness in both the left and right hands. These performances show his technical mastery. Itzhak Perlman is able to master each caprice with unsurpassed quality. That Itzhak Perlman can perform such that he retains the sound as does a jewel in the sunlight on all 24 caprices is of a quality that is beyond measurable boundaries.