# Recorded Jam performance credit and derivation record The recorded-band Jam prototype derives one chorus from **Slow Blues Backing Track in Cm** by Admiral Bob. The source provides aligned drums, bass, Rhodes, rhythm-guitar, and lead-guitar recordings at 55 BPM. - Source: - Source archive: - Source archive SHA-1: `cf6fbd02ef171a7b38983e87e5079dd55ddc1a36` - License: CC BY 3.0 Unported, - Attribution: “Slow Blues Backing Track in Cm” by Admiral Bob Project modifications are disclosed as required by the license. The drums are unchanged in pitch. The bass, Rhodes, and rhythm-guitar stems are shifted while retaining the original 55 BPM timing, and the lead-guitar stem is omitted to leave room for the player. The comparison prototype shifts the harmonic stems four semitones from C minor to E minor, adds a four-beat count-in, and fades the ending. Production Jam derives one looping 12-bar chorus in each of twelve minor keys, selecting the nearest shift from the C-minor source while leaving the drums natural. Both sets are remixed and encoded as Ogg/Opus and M4A/AAC. The count-in uses the VCSL hi-hat recording already credited in `NOTICE.md`. Re-run `scripts/vendor-recorded-jam.sh` for the comparison asset or `scripts/vendor-recorded-jam-band.sh` for the 12-key looping band. Derived and decoded-output hashes are enforced by the corresponding verifier; any audio change must use a new fingerprinted directory. Ogg page serials may vary between encodes without changing the decoded audio, so its verifier records both the current container and decoded content.