Sounds can be classified into four distinct experiential 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. — Pauline Oliveros, Deep Listening, 370

Categorization

• DEFINE: A compact taxonomy of sound types based on memory, novelty, exchange, and synesthetic/personal association.
• XREF: Blue sound resonates with the synesthetic color-sound link, echoing Kandinsky’s color-tone theory and general synesthesia research.
• corroborated: 2 independent passages support this claim — Pauline Oliveros, Deep Listening, 370