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
Shinen Nightmare	Shinigiwa Satellite			4:02	THE CONJURING EP	2014	Drop D	mute	1970-01-01
Supermarket Nightmare	Victims Family			2:55	White Bread Blues	1990	E Standard	mute	1970-01-01
Sweet Nightmares	Kitty In A Casket			3:03	Horror Express	2009	E Standard	mute	1970-01-01
The Air-Conditioned Nightmare	Mr. Bungle			3:57	California	1999	E Standard	mute	1970-01-01
The American Nightmare	Ice Nine Kills			4:14	The Silver Scream	2018	AEADG	mute	1970-01-01
The Nightmare Begins	Summoning the Lich			3:56	United in Chaos	2021	E Standard	mute	1970-01-01
The Nightmare Unravels	John 5			4:55	The Nightmare Unravels	2007	Drop D	mute	1970-01-01
The Nightmare's Beginning (FF7 Vincent's Theme)	Nobuo Uematsu			1:35	FINAL FANTASY VII - Original S	1997	Custom Tuning	mute	1970-01-01
Wake The Nightmares	Rage			5:01	Soundchaser	2003	D Drop C	mute	1970-01-01
We Are The Nightmare	Arsis			4:06	We Are The Nightmare	2008	E Standard	mute	1970-01-01
Welcome to Your Nightmare (Goosebumps)	The Tiberian Sons			2:59	Collateral Jammage	2016	BEADG	mute	1970-01-01
Wings of Nightmares	Counterparts			3:02	Nothing Left To Love	2019	D Drop C	mute	1970-01-01
Wings of Nightmares	Counterparts			2:59	Nothing Left to Love	2019	D Drop C	mute	1970-01-01
Your Best Nightmare Finale Metal ver.	Toby Fox			5:27	Undertale	2015	Custom Tuning	mute	1970-01-01
Zombie Blood Nightmare	Gama Bomb			2:40	Citizen Brain	2008	E Standard	mute	1970-01-01