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
Rashisa	SUPER BEAVER			4:30	Rashisa / Watakushi-Goto	2014	E Standard	mute	1970-01-01
Rat Salad	Black Sabbath			2:32	Paranoid	1970	E Standard	mute	1970-01-01
Razorblade Salvation	Jedi Mind Tricks			4:21	Servants in Heaven, Kings in Hell	2006	E Standard	mute	1970-01-01
Ready For Salvation	Kalmah			4:30	For The Revolution	2008	C# Standard	mute	1970-01-01
Recollection Disaster	Shinigiwa Satellite			3:27	DEAD WEIGHT	2017	Drop D	mute	1970-01-01
Red Cap Assault	Ashane			3:14	Final Fantasy Mystic Quest OST	2004	E Standard	mute	1970-01-01
Reign Of Sadness	Exumer			3:45	Possessed By Fire	1986	E Standard	mute	1970-01-01
Relatos Salvajes (Wild Tales)	Gustavo Santaolalla			1:33	Soundtrack	2014	Eb Standard	mute	1970-01-01
Remember Sadness	Hironobu Kageyama			2:56	Saint Seiya OST	1988	E Standard	mute	1970-01-01
Renaissance	Inventure			4:29	No Time to Waste	2020	Custom Tuning	mute	1970-01-01
Renaissance Faire	Blackmore's Night			4:22	Shadow Of The Moon	1997	C Standard	mute	1970-01-01
Requiem K.626 (Lacrimosa)	Wolfgang Amadeus Mozart			2:07	SNK vs. Capcom: The Match of the Millennium OST	1999	E Standard	mute	1970-01-01
Requiem K626. VIII. Lacrimosa	Wolfgang Amadeus Mozart			2:49	The 99 Darkest Pieces of Class	1792	E Standard	mute	1970-01-01
Resident Evil 4 Save Theme	Capcom			1:58	Resident Evil 4	2004	E Standard	mute	1970-01-01
Rest in Peace, Saith The Lord	Demetori			6:32	Determinism & DestruKction	2017	Custom Tuning	mute	1970-01-01