Sonor Meisterklasse GBKM 20 Deep Bass Metallophone Chromatic Add-On

The SONOR Meisterklasse GBKM 20 Deep Bass Metallophone Chromatic Add-On expands your GBKM 10 diatonic metallophone into a more versatile instrument by adding the missing chromatic notes needed for advanced repertoire, accompaniment, and harmonic exploration. Built with SONOR's premium specially alloyed metal bars and precision German craftsmanship, this add-on integrates seamlessly with the GBKM 10 to create a complete chromatic bass instrument.

Designed specifically for educators, universities, and advanced Orff Schulwerk programs, the GBKM 20 allows students to perform music in additional keys while expanding opportunities for improvisation, composition, and ensemble performance.

Why Add a Chromatic Extension?

Many elementary classrooms begin with diatonic instruments because they simplify early music instruction. As students develop, chromatic add-ons allow teachers to introduce additional key signatures, richer harmonies, and more advanced repertoire without replacing existing instruments.

• Expands the GBKM 10 into a complete chromatic instrument
• Adds accidentals needed for advanced Orff literature
• Supports improvisation and composition activities
• Perfect for upper elementary, middle school, and university programs
• Matches the tone, tuning, and appearance of the GBKM 10

Built to Match the GBKM 10

The GBKM 20 is engineered specifically for the SONOR Meisterklasse GBKM 10 Deep Bass Metallophone. The additional resonator box houses six precision-tuned alloy bars while providing storage space for the removable F# and Bb bars included with the original instrument. Because the diatonic instrument already includes mallets and accidentals, they are not included with this chromatic extension.

• Designed exclusively for the GBKM 10 Deep Bass Metallophone
• Specially alloyed precision-tuned metal bars
• Six-chamber pine plywood resonator box
• Precision overtone tuning to A440
• Professional German craftsmanship

Specifications

• Model: GBKM 20
• Series: SONOR Meisterklasse
• Type: Deep Bass Metallophone Chromatic Add-On
• Designed for: GBKM 10 Deep Bass Metallophone
• 6 chromatic bars
• Notes: C#, D#, G#, C#1, D#1, G#1
• Range: C#–G#1
• Specially alloyed metal bars
• 45 mm × 13 mm sound bars
• Six-chamber pine plywood resonator box
• Precision overtone tuning to A440
• Mallets not included

Best For

• Expanding existing GBKM 10 instruments
• Advanced Orff Schulwerk classrooms
• Upper elementary music education
• Middle school music programs
• University music education departments
• Schools performing chromatic repertoire

Complete Your SONOR Meisterklasse Classroom

• Pair with the GBKM 10 Deep Bass Metallophone.
• Browse the complete SONOR Meisterklasse Series.
• Explore SONOR Classroom Bundles.
• Compare SONOR Orff Instrument Series.
• Learn why balanced instrument selection creates stronger ensembles.

Why Buy from Teton Music?

Since 1999, Teton Music has helped schools and music educators build exceptional Orff classrooms with authentic SONOR instruments. We offer educator discounts, school purchase orders, personalized recommendations, and expert guidance to help you select the right instruments for your music program.