Sapphire Echo is a neutral, mid-energy track by Rox Indigo from The Breathing City Beautiful Scars, released November 20, 2025. It runs 2:19 at 104 テンポ (208 テンポ double-time) in B Major (Camelot 1B).
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| Track | Artist | Key | Energy | Camelot | BPM | ||
|---|---|---|---|---|---|---|---|
| Raven Fracture | Rox Indigo | D Major | 6 | 10B | 98 BPM | ||
| Neon Horizon | Nilo Zen | G Minor | 4 | 6A | 103 BPM | ||
| Star-Eater’s Lullaby | Voidpetal Drift | G Major | 3 | 9B | 147 BPM | ||
| Obsidian Ophelia | Etherwound Phantom | F Minor | 7 | 4A | 147 BPM | ||
| Pitchblack Psalmless | SignalHymn | G Major | 2 | 9B | 136 BPM | ||
| Umbra Unraveled | Thornbyte | D♭ Minor | 6 | 12A | 104 BPM | ||
| Pitchblack Phoenix Fall | Rusthaze Sentinel | D Major | 3 | 10B | 158 BPM | ||
| Vortex Static | Kai Moreno | A♭ Minor | 4 | 1A | 91 BPM | ||
| Pitchblack Paragon | Thornbyte | D♭ Minor | 6 | 12A | 104 BPM | ||
| Obsidian Void | Soren Vega | F Minor | 7 | 4A | 147 BPM | ||
| Negative Nebula | Nullflora | D♭ Major | 6 | 3B | 75 BPM | ||
| Night Circuit | Lysandro | F Minor | 8 | 4A | 119 BPM | ||
| Onyx Odyssey | Lotus Engine | G Major | 3 | 9B | 147 BPM | ||
| DNA Sequencing | Kessel | B♭ Minor | 0 | 3A | 61 BPM | ||
| Academic Support | Olaf Brinkman | D Major | 0 | 10B | 114 BPM | ||
| Midnight’s Monochrome | Nullflora | D Major | 7 | 10B | 145 BPM | ||
| Vortex Drift | The Paper Moons | D♭ Major | 4 | 3B | 175 BPM | ||
| Eco-Friendly Design | Sven Kuiper | A Major | 1 | 11B | 112 BPM | ||
| Shimmering Waves | Alma Luna | D♭ Major | 7 | 3B | 104 BPM | ||
| Deep Learning | Minfine | D♭ Minor | 4 | 12A | 106 BPM | ||
| Help Rapido | Amani Franco | D♭ Major | 4 | 3B | 132 BPM | ||
| Midnight Metamorphosis Mark | Neurospore Drift | D♭ Minor | 6 | 12A | 104 BPM | ||
| Obsidian Pulse | Malekai | B♭ Minor | 7 | 3A | 130 BPM | ||
| Cook Veloce | Rami Elisa | E Major | 2 | 12B | 82 BPM | ||
| Neural Network | Minfine | D♭ Minor | 4 | 12A | 106 BPM |