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
Quiet Complaint	Bloodred Hourglass			3:47	Heal	2017	D Drop C	mute	1970-01-01
Rationalist	August Burns Red			2:41	Constellations	2009	D Drop C	mute	1970-01-01
Rationalist	August Burns Red			2:41	Constellations	2009	D Drop C	mute	1970-01-01
Ratrace	Skindred			3:21	Roots Rock Riot	2007	D Drop C	mute	1970-01-01
Reach Out	Red Hot Chili Peppers			4:14	Return of the Dream Canteen	2022	Drop D	mute	1970-01-01
Readymade	Red Hot Chili Peppers			4:33	Stadium Arcadium	2006	E Standard	mute	1970-01-01
Red River	Blood Red Shoes			3:20	Water	2013	Drop D	mute	1970-01-01
Represent	The Red Jumpsuit Apparatus			3:20	Lonely Road	2009	D Drop C	mute	1970-01-01
Respect	Otis Redding			2:11	Otis Blue	1965	E Standard	mute	1970-01-01
Right On Time (Rough Mix)	Red Hot Chili Peppers			1:57	Californication	1999	E Standard	mute	1970-01-01
Right on Time	Red Hot Chili Peppers			1:55	Californication	1999	E Standard	mute	1970-01-01
Rivers Of Avalon	Red Hot Chili Peppers			3:44	The Zephyr Song	2002	E Standard	mute	1970-01-01
Road Trippin	Red Hot Chili Peppers			3:28	Californication	1999	E Standard	mute	1970-01-01
Rock Para Los Dientes	Patricio Rey y sus Redonditos de Ricota			3:34	Bang! Bang! Estás liquidado	1989	E Standard	mute	1970-01-01
Roid Rage	Red Vox			2:37	Blood Bagel	2016	E Standard	mute	1970-01-01