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
Prisoner of Society	The Living End			3:52	The Living End	1998	E Standard	mute	1970-01-01
Private Life	The Pretenders			6:28	Pretenders	1980	E Standard	mute	1970-01-01
Professor E. Gadd's Theme (Luigi's Mansion)	Kazumi Totaka/Nintendo			1:45	Luigi's Mansion Soundtrack	2001	E Standard	mute	1970-01-01
Propane Nightmares	Pendulum			5:16	In Silico	2008	E Standard	mute	1970-01-01
Prophecy Of The Laser Witch	Brendon Small			4:38	Galaktikon	2012	C Standard	mute	1970-01-01
Psycho In Love	Patent Pending			2:56	One Big Happy	2012	Drop D	mute	1970-01-01
Psychobilly Freakout	Reverend Horton Heat			2:42	Smoke 'Em If You Got 'Em	1991	E Standard	mute	1970-01-01
Psychobilly Freakout	Reverend Horton Heat (Wave Group)			2:43	Guitar Hero 2 Soundtrack	2006	E Standard	mute	1970-01-01
Rainbow Road	Nintendo			2:35	Mario Kart 8	2014	E Standard	mute	1970-01-01
Ravenous, Ravenous Rhinos	I Set My Friends On Fire			2:51	You Can't Spell Slaughter Without Laughter	2008	D Drop C	mute	1970-01-01
Ray of Light	ZHIEND			4:15	ECHO	2015	E Standard	mute	1970-01-01
Ray of Light (Japanese Ver.)	ZHIEND			4:15	ECHO	2015	E Standard	mute	1970-01-01
Red House	Jimi Hendrix			5:26	Red House	1969	E Standard	mute	1970-01-01
Red House Live	Jimi Hendrix Live			5:28	Live at Woodstock	1999	Eb 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