human-experience-filter-art/docs/binaural-candidate-pool.md

Binaural / entrainment candidate pool — stress-relief "Music" tracks (2026-07-02)

PARKED (2026-07-02): the operator dropped the binaural direction in favor of mellow chordal synth music — see docs/music-candidate-pool.md. This file is kept as the record of the binaural exploration (and its NC-licensing dead-ends).

Candidates for evolving the Music audio option into a stress-relief set of binaural-beat / brainwave-entrainment tracks that crossfade between each other (not a single loop). Operator brief: "binaural beats for stress relief."

All 11 below are CC0 (public domain — no attribution legally required; we credit anyway as courtesy), all stereo, all sourced from freesound.org and license- verified by fetching each page. Review gallery (gitignored, local-only, like review_audio.html): simulator/static/review_binaural.html → open /review_binaural.html with the sim server running. It streams each track's public HQ preview so you can audition + tick keepers.

Caveats (operator, read before picking)

• True binaural (#1–7) needs headphones. The beat is the L/R frequency difference, so on speakers it collapses to a steady carrier tone (no entrainment). #8–11 are ambient sub-bass / pulsing drones that keep the calm feel on speakers.
• Band coverage: heavy on delta (0.5–1.5 Hz) + one clean theta (4 Hz, #2). No CC0 alpha (8–12 Hz) track surfaced — widen to CC-BY (FMA/ccMixter) if wanted.
• No clean CC0/CC-BY isochronic or monaural (the speaker-correct entrainment type) was found — every hit was NC/SA or unlicensed (see rejects). For speaker playback, lean on #8–11 for the "beat" feel.
• Previews vs originals: the cdn.freesound.org/…-hq.mp3 URLs are public streamable previews (verified live, HTTP 206). The originals (WAV/AIF/full-MP3) need a free freesound login; CC0 permits self-hosting, so for keepers download the originals and host on R2 — do not hot-link the CDN in production.

Candidates

#	id	title	artist	source page	license	dur	type	beat / carrier
1	fs75309	60-64-delta	iantm	https://freesound.org/people/iantm/sounds/75309/	CC0	0:30	true-binaural	4 Hz · 60/64 Hz
2	fs457654	Binaural Beats (Theta Waves 4 Hz)	Fabrizio84	https://freesound.org/people/Fabrizio84/sounds/457654/	CC0	30:00	true-binaural	4 Hz theta
3	fs803742	1.23456789 Hz binaural beat (69L/70.23R)	itchytooth	https://freesound.org/people/itchytooth/sounds/803742/	CC0	60:00	true-binaural	1.23 Hz delta · 69/70.23 Hz
4	fs414271	Binaural Delta 440/440.5 Hz	pbabin	https://freesound.org/people/pbabin/sounds/414271/	CC0	10:00	true-binaural	0.5 Hz · 440/440.5 Hz
5	fs414272	Binaural Delta 500/501.5 Hz	pbabin	https://freesound.org/people/pbabin/sounds/414272/	CC0	10:00	true-binaural	1.5 Hz · 500/501.5 Hz
6	fs414273	Binaural Delta 52/52.5 Hz	pbabin	https://freesound.org/people/pbabin/sounds/414273/	CC0	10:00	true-binaural	0.5 Hz · 52/52.5 Hz
7	fs414274	Binaural Delta 60/61.5 Hz	pbabin	https://freesound.org/people/pbabin/sounds/414274/	CC0	10:00	true-binaural	1.5 Hz · 60/61.5 Hz
8	fs856225	Delta Pulse Subharmonic Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/856225/	CC0	5:00	ambient+beats (speaker-ok)	delta sub-bass (procedural)
9	fs854874	Void Monolith Subharmonic Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/854874/	CC0	5:00	ambient (speaker-ok)	dark sub-drone
10	fs860122	Expanding & Vibrating Stereo Pulsating Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/860122/	CC0	2:00	ambient+beats (speaker-ok)	slow stereo pulsation
11	fs493524	Pulse Breath (lower pref)	phylobates	https://freesound.org/people/phylobates/sounds/493524/	CC0	1:40	ambient binaural	octaves of G / G♭

Preview MP3s (for the review page) follow https://cdn.freesound.org/previews/<dir>/<id>_<uploader>-hq.mp3 — exact URLs are embedded in review_binaural.html.

Round 2 — musical / evolving (the "not boring" set, 2026-07-02)

Operator found the pure-tone set (#1–7) too plain. Reality: truly musical tracks with a confirmed binaural layer are almost all NC (see rejects). Best legitimate options — pick for how they sound; treat binaural as a bonus:

id	title	artist	source	license	dur	binaural?
fs856223	Theta Gateway Sacred Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/856223/	CC0	5:00	capable (theta band; not certified on render)
fs856221	Raga of Stillness Sacred Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/856221/	CC0	5:00	capable (Δ/θ/α/β optional)
fs856220	Ice Cathedral Sacred Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/856220/	CC0	5:00	capable
fs856224	Vowel of the Deep Sacred Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/856224/	CC0	5:00	capable
fs856222	Stellar Vowel Sacred Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/856222/	CC0	5:00	capable
fs856329	Harmonic Chamber High-Frequency Drone (MANTICE)	bassimat	https://freesound.org/people/bassimat/sounds/856329/	CC0	5:00	capable
fs854438	Immersive Ethereal Generative Ambient (Floating Harmonics)	bassimat	https://freesound.org/people/bassimat/sounds/854438/	CC0	11:33	no (richest single piece)
fma_cosmic	Cosmic Waves	HoliznaCC0	https://freemusicarchive.org/music/holiznacc0/space-sleep-meditation/cosmic-waves/	CC0	33:04	no (long-form melodic pads)
fma_dream	DreamScape	HoliznaCC0	https://freemusicarchive.org/music/holiznacc0/space-sleep-meditation/dreamscape/	CC0	21:59	no
fma_rain	Rain / Sleep / Meditation	HoliznaCC0	https://freemusicarchive.org/music/holiznacc0/space-sleep-meditation/rain-sleep-meditation/	CC0	14:35	no (rain + pads)
ccm_shagrugge	How to Get Rid of a Dream (real imagination mix)	shagrugge	http://dig.ccmixter.org/files/shagrugge/12629	CC BY 3.0	~	yes-ish (binaural-filtered vocals; experimental)

• The MANTICE Sacred Drone series is the composed extension of Round-1 #8–10 (same generator; the generator does binaural entrainment across Δ/θ/α/β, but the individual freesound renders don't certify the beat is on — bassimat could confirm/render on request).
• HoliznaCC0 (FMA, CC0) = the strongest pure-music options; no binaural layer.
• FMA files.freemusicarchive.org/... URLs verified live (206) — safe to self-host. The ccMixter shagrugge URL is hotlink-protected (403) — download in a browser and self-host.

Opt-in (outside the CC0/CC-BY rule — needs operator OK)

• "Hang Binaural" — Mindseye — https://freemusicarchive.org/music/MindsEye/single/hang-binaural — CC BY-SA 4.0. The single best musical+confirmed-binaural fit (hang-drum music + real binaural beats, 3:36, stereo), but ShareAlike copyleft. Add only if SA is acceptable.

Rejected / could not verify

• archive.org "Binaural Beats – Alpha/Beta/Theta/Delta" & "Isochronic Tones & Binaural Beats Combined" (loopool / Jean-Paul Garnier) — CC BY-NC-SA 3.0 (NC). The most promising isochronic set — rejected for the NC clause.
• archive.org "Om Alpha Brainwave Entrainment Loop" (Entraino / KS Chauhan; freesound chauhans/100370) — CC BY-NC 3.0. Rejected (NC).
• archive.org "1hr 30 Min Theta Binaural Beat (7 Hz)" (Chari G) — no license shown. Rejected (unverifiable).
• freesound "deadthetawaves.wav" (NoiseCollector/43295) — license fine (CC BY 3.0) but "evil sounding loop of the living dead" — rejected for fit, not license. Back pocket only if an unsettling deep-scale track is ever wanted.
• TunePocket / dialedggsound / miraclefrequencies / audio.com "Theta 7Hz" — "royalty-free"/commercial pages, murky redistribution, no per-track CC license.
• Round 2 NC drops (great content, non-commercial licence): "Fear Nothing (Relaxation Mix)" — Jeris (CC BY-NC), "On the Earth" — Quarkstar (CC BY-NC), "Timeless (Binaural Beatmix)" — duckett (CC BY-NC), "Ambient Meditation" — Scott Holmes (CC BY-NC). ccMixter's binaural tag is overwhelmingly NC; only shagrugge (CC BY) survived.

Next

Operator auditions review_binaural.html, ticks keepers (Copy picks). Then we wire the playback: the Music source becomes a multi-track set that crossfades between the kept tracks (architecture decision — replace vs. join the ethereal loop — deferred to that step; see audio-music-option).