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
Re-done	Modern Baseball			4:35	Sports	2012	Eb Drop Db	mute	1970-01-01
Reach Down	Temple Of The Dog			11:17	Temple Of The Dog	1991	E Standard	mute	1970-01-01
Rebel Yell (Billy Idol Cover)	Children Of Bodom			4:14	Skeletons In The Closet	2009	D Standard	mute	1970-01-01
Rebel Yell (Billy Idol Cover)	Dope			4:08	No Regrets	2009	Eb Drop Db	mute	1970-01-01
Reckless Abandon	Blink-182			3:16	Take Off Your Pants and Jacket	2001	E Standard	mute	1970-01-01
Recuerdos de la Alhambra	Francisco Tárrega			2:45	Francisco Tárrega	2017	E Standard	mute	1970-01-01
Red Door	Julien Baker			3:44	Single	2017	Drop D	mute	1970-01-01
Red Light Indicates Doors Are Secured	Arctic Monkeys			2:26	Whatever People Say I Am, That's What I'm Not	2006	E Standard	mute	1970-01-01
Redo	Kara Hajimeru Isekai Seikatsu			4:21	-	2016	E Standard	mute	1970-01-01
Redo	Konomi Suzuki			4:21	Re:Zero OP	2016	E Standard	mute	1970-01-01
Redondo Beach	Patti Smith			3:30	Horses	1975	E Standard	mute	1970-01-01
Reeses Pieces I don't Know Who John Cleese Is	I Set My Friends On Fire			6:26	You Can't Spell Slaughter Without Laughter	2008	D Drop C	mute	1970-01-01
Reino Olvidado	Rata Blanca			5:35	Reino Olvidado	2008	E Standard	mute	1970-01-01
Remain Indoors	Periphery			6:13	Periphery III: Select Difficulty	2016	Custom Tuning	mute	1970-01-01
Return to Tortuga for Dogs	Alestorm			3:58	Seventh Rum of a Seventh Rum for Dogs	2022	C Standard	mute	1970-01-01