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
Redfog	Orbit Culture			6:01	Redfog	2018	B Drop A	mute	1970-01-01
Redneck Stomp	Obituary			3:34	Frozen In Time	2005	D Standard	mute	1970-01-01
Reduced To The Failure Of Prayer	Skeletonwitch			2:55	Forever Abomination	2011	E Standard	mute	1970-01-01
Reflection	ONE OK ROCK			3:42	Kanjou Effect	2008	Drop D	mute	1970-01-01
Reflections	Diana Ross & The Supremes			2:53	Reflections	1967	E Standard	mute	1970-01-01
Reflections Of My Life	The Marmalade			4:18	Reflections Of My Life	1969	E Standard	mute	1970-01-01
Reflections Through Fire	Sylosis			4:33	Conclusion of an Age	2008	E Standard	mute	1970-01-01
Reformation	Amorphis			4:36	The Beginning of Times	2011	D Standard	mute	1970-01-01
Reformation (Wrath Of The Old Gods)	Kiuas			6:15	Reformation	2006	D Drop C	mute	1970-01-01
Refreshing Morning	Atkahiro Unisuga			2:21	The Legend of Heroes: Sen no Kiseki Original Soundtrack	2013	E Standard	mute	1970-01-01
Refuge of Souls	Ancestral			5:00	Master of Fate	2017	D Standard	mute	1970-01-01
Regain the Fire	Insomnium			4:30	One For Sorrow	2012	D Standard	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
Regret & House of Eternal Hunt	Avatar			7:03	Feathers & Flesh	2016	B Standard	mute	1970-01-01