Sonic identity can be sorted into old, new, borrowed and blue categories.

Evidence

Old sound—A sound that you remember from a long time ago. … New Sound—A sound that you have never made before. … Borrowed sound—A sound that you borrow from someone else. … Blue sound—A sound that is blue for you. … First listen inwardly to find your sound to be expressed vocally. Voice each kind of sound—old, new, borrowed, blue—from one to three times within a time frame of about five minutes. Pace yourself by listening to every one and everything. — Pauline Oliveros, Deep Listening, 367

Categorization

• SEED: A ready-made pedagogical exercise for teaching listening and vocal improvisation — the four categories offer a scaffold for any sound exploration workshop.
• XREF: Connects to Oliveros’s broader practice of listening as attention, and to the book’s earlier exercises on inward listening and pacing.
• corroborated: 2 independent passages support this claim — Pauline Oliveros, Deep Listening, 367