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
Rachael	She Wants Revenge			4:30	This is Forever	2007	E Standard	mute	1970-01-01
Raped in Hatred by Vines	The Black Dahlia Murder			4:42	Everblack	2013	C Standard	mute	1970-01-01
Reborn	Stone Sour			3:15	Come What(Ever) May	2006	Eb Drop Db	mute	1970-01-01
Red Flags	Aim High			3:05	Severed Ties	2020	D Drop C	mute	1970-01-01
Red Light Indicates Doors Are Secured	Arctic Monkeys			2:26	Whatever People Say I Am, That's What I'm Not	2006	E Standard	mute	1970-01-01
Red Orange Yellow	The Photo Atlas			3:08	No, Not Me, Never	2007	E Standard	mute	1970-01-01
Reduced To Ash	Annihilator			3:12	Never, Neverland	1990	E Standard	mute	1970-01-01
Reduced To The Failure Of Prayer	Skeletonwitch			2:55	Forever Abomination	2011	E Standard	mute	1970-01-01
Relentless Reckless Forever	Children of Bodom			4:44	Relentless Reckless Forever	2011	D Drop C	mute	1970-01-01
Remain Nameless	Hatebreed			2:53	Perseverance	2002	D Drop C	mute	1970-01-01
Respect	Aretha Franklin			2:30	I Never Loved a Man the Way I Love You	1967	E Standard	mute	1970-01-01
Responsibility	MxPx			2:43	The Everlasting Moment	2000	E Standard	mute	1970-01-01
Reverie/Harlequin Forest	Opeth			11:42	Ghost Reveries	2005	Custom Tuning	mute	1970-01-01
Ridden With Disease	Autopsy			4:54	Severed Survival	1989	C Standard	mute	1970-01-01
Righteous	Juice WRLD			4:05	Legends Never Die	2020	E Standard	mute	1970-01-01