ShredDB is an experimental .shred library, I removed the audio so it's pretty useless. You can find the source .psarc files here.

Song	Artist	Play	Shred	Length	Album	Year	Tuning	Uploader	Updated	Delete
Past Regrets, Future Threats	Call Atlantis			2:53	L'Esprit de l'Escalier	2011	Drop D	mute	1970-01-01
REGRET	The GazettE			4:33	Stacked Rubbish	2007	D Standard	mute	1970-01-01
Regret	Drowning Pool			3:16	Drowning Pool	2010	C# Drop B	mute	1970-01-01
Regret & House of Eternal Hunt	Avatar			7:03	Feathers & Flesh	2016	B Standard	mute	1970-01-01
Regret 1993	New Order			4:11	Best Of	1994	E Standard	mute	1970-01-01
Regret And The Grave	Cattle Decapitation			4:42	The Harvest Floor	2009	Eb Standard	mute	1970-01-01
Regret Not	All That Remains			4:23	This Darkened Heart	2004	D Standard	mute	1970-01-01
Ritual of Regret	Singularity			3:10	Place of Chains	2019	D Drop C	mute	1970-01-01
Shadows and Regrets	Yellowcard			4:02	Paper Walls	2007	Custom Tuning	mute	1970-01-01
Taste Of Regret	Of Mice & Men			3:33	EARTHANDSKY	2019	D Drop C	mute	1970-01-01
Taste of Regret	Of Mice & Men			3:33	EARTHANDSKY	2019	C Standard	mute	1970-01-01
Taste of Regret (65days' Ver)	Of Mice & Men			3:32	EARTHANDSKY	2019	D Drop C	mute	1970-01-01