| Audio quality |
|---|
| 10 | Perfect (modern studio recording) |
| 9 | Very good, but not perfect |
| 8 | Bad FR or noisy, but definitely ok |
| 7 | Poor FR or very noisy |
| 6 | Pretty bad, but listenable |
| m | Mono |
| |
| [] | Indicates the title of the original recording |
| * | Historic or recommended recording |
| + | Recorded over multiple days |