• Series: Schott
• Publisher: Schott
• Composer: Charles Keller
• Price: 24.99 (US)

These duets, composed in 1855 are intended to help students to progress technically and especially musically in carefully designed stages. Starting with the octave g'-g'', students acquire a solid musical foundation before progressing to a wide range of pieces in different styles and characters which in turn provide them with the motivation for further study.

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