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
Rage Your Dream	M.O.V.E.			4:38	Initial D Final Best Collection	1998	Drop D	mute	1970-01-01
Rain Song	Girls Dead Monster			5:08	Angel Beats Perfect Vocal Collection	2017	E Standard	mute	1970-01-01
Rainbow Dash's Theme	Mando Pony			2:25	The Ultimate MandoPony Collection	2012	E Standard	mute	1970-01-01
Raison d'etre	DenKare			4:18	Denki's Music Collection I	2010	Eb Standard	mute	1970-01-01
Restless Nights	Bruce Springsteen			3:50	The Ties That Bind: The River Collection	1980	E Standard	mute	1970-01-01
Ride A White Swan	T. Rex			2:18	The Essential Collection	1970	E Standard	mute	1970-01-01
Rock Me Baby	B.B. King			3:02	The Ultimate Collection	1964	E Standard	mute	1970-01-01
Romeo to Cinderella	Poppin Party			4:43	BanG Dream! Girls Band Party! Cover Collection Vol.4	2020	E Standard	mute	1970-01-01
Roses	SAINt JHN - Imanbek Remix			2:58	Collection One	2019	E Standard	mute	1970-01-01
Roulette	Bruce Springsteen			4:01	The Ties That Bind: The River Collection	1979	E Standard	mute	1970-01-01
Rubi's Got A gun	Gypsy Pistoleros			3:42	Beautiful Disaster (The Complete 32 Track Ultimate Anthology Collection)	2011	E Standard	mute	1970-01-01
STEP BY STEP	ZIGGY			4:31	Detective Conan Theme Song Collection	1996	E Standard	mute	1970-01-01
Samishikute Nemurenai	Yuka Takeuchi			4:29	MEGAZONE23 VOCAL COLLECTION	1990	E Standard	mute	1970-01-01
Seinaru Ibarade turanuite	DenKare			3:34	Karen's Music Collection II	2019	BEADG	mute	1970-01-01
Senakagoshi ni Sentimental	Kumi Miyasato			4:25	MEGAZONE23 VOCAL COLLECTION	1991	E Standard	mute	1970-01-01