Mark Tree individual bars 1.mp3–23.mp3 by Kion001 on Freesound, licensed CC BY 3.0. Edited for Echoes of Time; filtering, gain normalization, fades and OGG conversion.
https://creativecommons.org/licenses/by/3.0/
https://freesound.org/people/Kion001/packs/24999/

Preserved each complete recorded strike and short decay at original pitch; 280 Hz high-pass / 12.5 kHz low-pass; gentle peak leveling to -12 dBFS before Vorbis encoding; 3 ms entrance and 25 ms endpoint fades; stereo 44.1 kHz Vorbis quality 5. No synthesized audio, pitch shifting, sweep slicing, looping, or fabricated sustain.

Retain attribution, source/license links and modification notice. Do not imply endorsement.

Source files:
1.mp3 — https://freesound.org/people/Kion001/sounds/440178/ — CC BY 3.0
2.mp3 — https://freesound.org/people/Kion001/sounds/440192/ — CC BY 3.0
3.mp3 — https://freesound.org/people/Kion001/sounds/440195/ — CC BY 3.0
4.mp3 — https://freesound.org/people/Kion001/sounds/440194/ — CC BY 3.0
5.mp3 — https://freesound.org/people/Kion001/sounds/440199/ — CC BY 3.0
6.mp3 — https://freesound.org/people/Kion001/sounds/440198/ — CC BY 3.0
7.mp3 — https://freesound.org/people/Kion001/sounds/440187/ — CC BY 3.0
8.mp3 — https://freesound.org/people/Kion001/sounds/440188/ — CC BY 3.0
9.mp3 — https://freesound.org/people/Kion001/sounds/440185/ — CC BY 3.0
10.mp3 — https://freesound.org/people/Kion001/sounds/440177/ — CC BY 3.0
11.mp3 — https://freesound.org/people/Kion001/sounds/440176/ — CC BY 3.0
12.mp3 — https://freesound.org/people/Kion001/sounds/440175/ — CC BY 3.0
13.mp3 — https://freesound.org/people/Kion001/sounds/440182/ — CC BY 3.0
14.mp3 — https://freesound.org/people/Kion001/sounds/440181/ — CC BY 3.0
15.mp3 — https://freesound.org/people/Kion001/sounds/440180/ — CC BY 3.0
16.mp3 — https://freesound.org/people/Kion001/sounds/440179/ — CC BY 3.0
17.mp3 — https://freesound.org/people/Kion001/sounds/440184/ — CC BY 3.0
18.mp3 — https://freesound.org/people/Kion001/sounds/440183/ — CC BY 3.0
19.mp3 — https://freesound.org/people/Kion001/sounds/440193/ — CC BY 3.0
20.mp3 — https://freesound.org/people/Kion001/sounds/440191/ — CC BY 3.0
21.mp3 — https://freesound.org/people/Kion001/sounds/440190/ — CC BY 3.0
22.mp3 — https://freesound.org/people/Kion001/sounds/440197/ — CC BY 3.0
23.mp3 — https://freesound.org/people/Kion001/sounds/440196/ — CC BY 3.0

Preview delivery URLs and checksums: manifest.json.
Original files preserved in references/virtual-chimes/.
No perceptual listening verification was available; audition in the review package.