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
Reincarnation	ZUN			2:56	Phantasmagoria of Dim.Dream OST	1997	E Standard	mute	1970-01-01
Relax and Reflect	Yoko Shimomura			3:00	Final Fantasy XV OST	2016	E Standard	mute	1970-01-01
Remember Sadness	Hironobu Kageyama			2:56	Saint Seiya OST	1988	E Standard	mute	1970-01-01
Remorse (Acoustic)	Scattle			2:52	Hotline Miami 2 OST	2015	E Standard	mute	1970-01-01
Repose	Keiichi Okabe			2:42	Neir OST	2010	E Standard	mute	1970-01-01
Requiem For Humanity	Inon Zur/Maciej Dąbrowski			3:10	Fallout 3 OST	2014	E 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
Resident Evil 2 - Scenario B Ending Theme	Capcom			2:38	Resident Evil 2 OST	1998	Custom Tuning	mute	1970-01-01
Resident Evil 2 Claire B Credits	Ueda, Uchiyama, Nishigaki			2:38	Resident Evil 2 OST	1998	Custom Tuning	mute	1970-01-01
Resident Evil 2 Ending Theme B	Masami Ueda			2:37	Resident Evil 2 OST	1998	E Standard	mute	1970-01-01
Residents (Propagator Extermination in Space)	Nobuo Uematsu	Combo Combo2		3:09	FF8 OST	1999	E Standard	mute	1970-01-01
Resurrection	COIL			3:59	Gitaroo Man OST	2001	E Standard	mute	1970-01-01
Revealing the Darkness	Brainstorm			4:49	Midnight Ghost	2018	D Drop C	mute	1970-01-01
Revelation (Divus Pennae ex Tr	Symphony X			9:20	Paradise Lost	2007	D Standard	mute	1970-01-01
Revelations	Judas Priest			7:08	Nostradamus	2008	E Standard	mute	1970-01-01