Ask learners to sing, then play, simple familiar tunes by ear/from memory. Encourage them to check intonation against open strings/harmonics.
Internalising the sound is essential. Some teachers like to use sol-fa to do this.
Use an accompaniment to provide a tonal point of reference.
Hearing notes within a harmonic context helps learners to develop better intonation.
Build up chords, each learner playing one note.
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