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
Rouningyou no Yakata	Seikima-II			5:42	THE END OF THE CENTURY	1986	E Standard	mute	1970-01-01
Route Around	Rebelution			4:01	Peace of Mind	2012	E Standard	mute	1970-01-01
Routes	Lamb of God			3:14	Lamb of God	2020	Drop D	mute	1970-01-01
Royal Blood	Bury Tomorrow			3:56	The Union of Crowns	2012	C# Drop B	mute	1970-01-01
Royal Orphan	Scale The Summit			3:41	In a World Of Fear	2017	BEADG	mute	1970-01-01
Rubber Biscuit	The Blues Brothers			2:53	Briefcase Full Of Blues	1978	E Standard	mute	1970-01-01
Ruby Pool	VOLA			4:12	Applause of a Distant Crowd	2018	E Standard	mute	1970-01-01
Ruined Castle Corridor	Michiru Yamane			3:14	Castlevania Harmony of Despair OST	2010	Drop D	mute	1970-01-01
Rule Of Nines	Spiritbox			3:35	Rule Of Nines	2019	Custom Tuning	mute	1970-01-01
Rum Rage	Sticky Fingers			4:15	Land Of Pleasure	2014	E Standard	mute	1970-01-01
Rumors Of My Demise Have Been Greatly Exaggerated	Rise Against			4:17	Siren Song Of The Counter Culture	2004	Eb Standard	mute	1970-01-01
Run After the Sun	Aria			6:13	Generator of Evil	1998	E Standard	mute	1970-01-01
Run Runaway	Slade			3:49	The Very Best of Slade	1983	E Standard	mute	1970-01-01
Run With The Wind	Axel Rudi Pell			4:46	Circle Of The Oath	2012	Eb Standard	mute	1970-01-01
Runaground	James			4:13	The Best of James	1998	E Standard	mute	1970-01-01