Match the instrument with its classification group: piano
snare drum
trumpet
cowbell

idiophone
chordophone
membranophone
aerophone

cowbell is idiophone , the piano is chordophone , the snare drum is membranophone , the trumpet is an aerophone.

Explanation:

a chromatic scale uses the twelve tones of the octave, while a regular scale only uses eight, or seven different notes (as the first note is played twice)

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