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	TURISAS			3:56	Rasputin	2007	E Standard	mute	1970-01-01
Ratrace	Skindred			3:21	Roots Rock Riot	2007	D Drop C	mute	1970-01-01
Reach the Sky	The Poodles			3:12	Sweet Trade	2007	E Standard	mute	1970-01-01
Read My Mind	The Killers			4:09	Sam's Town	2007	Eb Standard	mute	1970-01-01
Ready, Set, Go!	Tokio Hotel			3:40	Scream	2007	Eb Standard	mute	1970-01-01
Ready, Set, Go!	Tokio Hotel			3:39	Scream	2007	Eb Standard	mute	1970-01-01
Rebel Angel	The Dollyrots			2:43	Because I'm Awesome (Digital Edition Bonus Track)	2007	E Standard	mute	1970-01-01
Rebel Army Theme (PSP Version)	Nobuo Uematsu			2:32	Final Fantasy 2 PSP	2007	E Standard	mute	1970-01-01
Reborn	Drowning Pool			4:09	Full Circle	2007	C# Drop B	mute	1970-01-01
Reckoner	Radiohead	Bass2		4:50	In Rainbows	2007	E Standard	mute	1970-01-01
Red Dress	LoveHateHero			3:40	White Lies	2007	D Drop C	mute	1970-01-01
Red Hands	The Dear Hunter			6:10	Act II The Meaning of, and All Things Regarding Ms. Leading	2007	E Standard	mute	1970-01-01
Red Orange Yellow	The Photo Atlas			3:08	No, Not Me, Never	2007	E Standard	mute	1970-01-01
Red Stars	The Birthday Massacre	Bass2		3:45	Walking With Strangers	2007	Drop D	mute	1970-01-01
Red Wings Over Baron	Powerglove			7:50	Metal Kombat For The Mortal Man	2007	Custom Tuning	mute	1970-01-01