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
Rasputin	Boney M.			4:49	Nightflight to Venus	1978	E Standard	mute	1970-01-01
Rayless	Chris Letchford			4:07	Lightbox	2014	Custom Tuning	mute	1970-01-01
Real Boy	La Sera			3:18	Sees the Light	2011	E Standard	mute	1970-01-01
Red Right Hand	Arctic Monkeys			4:22	Crying Lightning - EP	2009	Drop D	mute	1970-01-01
Reject Yourself	Killswitch Engage			4:50	As Daylight Dies	2006	D Drop C	mute	1970-01-01
Renewal	Doug Smith			4:59	Acoustic Guitar Highlights 2	1998	DADGAD	mute	1970-01-01
Return of the Rat	Nirvana			3:12	With The Lights Out (Disc 2)	2004	Eb Standard	mute	1970-01-01
Ride The Lightning	Metallica			6:40	Ride The Lightning	1984	E Standard	mute	1970-01-01
Ride The Lightning Full Album	Metallica			48:19	Ride The Lightning	1984	E Standard	mute	1970-01-01
Riot	Sugarcult			3:31	Lights Out	2006	Drop D	mute	1970-01-01
Rivers of Babylon	Boney M			4:19	Nightflight to Venus	1978	E Standard	mute	1970-01-01
Rogues	Incubus			3:59	Light Grenades	2006	E Standard	mute	1970-01-01
Roland	Interpol			3:39	Turn On the Bright Lights	2002	Drop D	mute	1970-01-01
Rough Landing, Holly,	Yellowcard			3:38	Lights and Sounds	2006	E Standard	mute	1970-01-01
Sacred Grove	Koji Kondo			2:12	The Legend of Zelda: Twilight Princess	2006	E Standard	mute	1970-01-01