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
Rub Yer Daddy's Lucky Belly	Nine Pound Hammer			2:22	Kentucky Breakdown	2004	E Standard	mute	1970-01-01
Rub a Dub	311			2:46	Transistor Explicit	2001	E Standard	mute	1970-01-01
Rub out the Coffee Dot	OrangeCoffee			3:51	The Lounge Map 3 - evening caffelatte set	2013	E Standard	mute	1970-01-01
Rubato Industry	Wobbler			12:32	Hinterland	2005	Custom Tuning	mute	1970-01-01
Rubber Biscuit	The Blues Brothers			2:53	Briefcase Full Of Blues	1978	E Standard	mute	1970-01-01
Rubber Ring	The Smiths			3:51	Louder Than Bombs	1987	E Standard	mute	1970-01-01
Rubberband Girl	Kate Bush			4:49	The Red Shoes	1993	Drop D	mute	1970-01-01
Rube Goldberg Variations	Thank You Scientist			8:56	Stranger Heads Prevail	2016	Custom Tuning	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
Rubicon	Deftones			4:59	Gore	2016	BEADG	mute	1970-01-01
Rubicon Artist	Intervals			4:45	The Way Forward	2017	BEADG	mute	1970-01-01
Rubicon Artist	Intervals			4:42	The Way Forward	2017	Custom Tuning	mute	1970-01-01
Rubina's Blue Sky Happiness	Joe Satriani			5:55	The Extremist	1992	E Standard	mute	1970-01-01
Ruby	Kaguu			3:25	Wistful	2018	E Standard	mute	1970-01-01
Ruby	Origami Angel			1:22	Gen 3	2019	Open Db/C#	mute	1970-01-01