Instruct: Classify Amazon reviews into positive or negative sentiment
Query: superfluous, smarmy, and ineptly written

The GROVE'S DICTIONARY OF JAZZ is thorough, authoritative, and eminently readable: there is no reason for this "encyclopedia of jazz" to exist. Yet exist it does, and it is hardly an encyclopedia of jazz. It has biographical and recording-title entries only. Its information is sketchy and inaccurate. Its prose is glib, clumsy, and amateurish. Its diction is indiscriminately inconsistent. Prefer the GROVE'S DICTIONARY OF JAZZ.Also recommended: PENTATONIC SCALES FOR THE JAZZ-ROCK KEYBOARDIST by Jeff Burns.