Related Clues:

• C minor, say
• Musical trio, often
• Pianist's group of notes
• Triad, e.g
• Keyboard combination
• Three or more notes together
• Note grouping
• Combination of musical notes
• Guitar book diagram
• Set of keys, maybe
• Set of notes
• Bit of guitar music notation
• Guitarist's combo
• A major, for one
• C-E-G, e.g., in music