**Work** : Fifty Progressive Duets, Op. 80 
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**Composer** : Joseph Küffner [[https://en.wikipedia.org/wiki/Joseph_K%C3%BCffner]]
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**Difficulty Ranking** : [[i|I]]-[[ii|II]]
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**Publisher**: Carl Fischer, Inc. (Published in H. Klose Celebrated Method for the Clarinet)
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**Year Published** : 1946
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**Instrumentation** : 2 Bb Clarinets
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**Potential Pedagogical Applications** : Tone development, beginning ensemble mechanics, articulation matching, intonation (unison, octave, interval), ornamentation 
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**Sample Recording** :
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**Where to Purchase Sheet Music** : [[http://www.jwpepper.com/10535754.item#.VqSILfl9600]]
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**Annotation** : This collection of progressive duets is included in the H. Klose Method and begins at the elementary level of playing. The early duets are primarily homophonic and can be used to help young students develop good concepts of sound when play alongside the instructor during lessons. Later duets in the collection cover specific types of articulation and ornamentation and can be used as supplemental materials for these concepts in instruction. As the duets get more difficult as the collection continues, the grade assigned covers both I and II.
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{{:kuffner_fifty_progressive_duets.png?nolink|}}