According to Osho, the instrument of his music is you—the disciple, the listener. He has no guitar; he is only a passage, while existence itself is the music. The resonance you feel around him arises from your own love, trust, and receptivity. When desire and ambition drop, a natural music appears, echoing through your openness.
The instrument Osho plays is you; he’s just a channel and the universe provides the music.