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
Reflect The Storm	In Flames			4:19	Come Clarity	2006	Custom Tuning	mute	1970-01-01
Regenerate	Fear Factory			4:05	Genexus	2015	Custom Tuning	mute	1970-01-01
Regenerate	We Came As Romans			3:50	Regenerate	2015	Custom Tuning	mute	1970-01-01
Regress	Polaris			3:29	The Guilt & The Grief	2016	Custom Tuning	mute	1970-01-01
Regression/Overture 1928	Dream Theater			5:43	Metropolis Pt.2: Scenes From A Memory	1999	Custom Tuning	mute	1970-01-01
Rei -Paranoia-	Hallucination Aria			4:59	Toushou Hysteria	2019	Custom Tuning	mute	1970-01-01
Reign Of Dreams	Rivers Of Nihil			3:22	Monarchy	2015	Custom Tuning	mute	1970-01-01
Reila	The GazettE			7:52	Single	2005	Custom Tuning	mute	1970-01-01
Reincarnation	Season Of Ghosts			6:07	The Human Paradox	2014	Custom Tuning	mute	1970-01-01
Reiro to Shita Kyoki	Touka Hebizuka			2:56	Kata ni Chome	2022	Custom Tuning	mute	1970-01-01
Relapse	Polaris			3:21	The Mortal Coil	2017	Custom Tuning	mute	1970-01-01
Relapse	Wage War			2:59	Manic	2021	Custom Tuning	mute	1970-01-01
Relentless Mutation	Archspire			4:37	Relentless Mutation	2017	Custom Tuning	mute	1970-01-01
Relic	Graupel			3:07	Fade Away EP	2020	Custom Tuning	mute	1970-01-01
Remain Indoors	Periphery			6:13	Periphery III: Select Difficulty	2016	Custom Tuning	mute	1970-01-01