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
Fortress	Alter Bridge			7:41	Fortress	2013	Custom Tuning	mute	1970-01-01
Fortress	Pinback			4:14	Summer In Abaddon	2004	Custom Tuning	mute	1970-01-01
Fortress	Pinback			4:13	Summer In Abaddon	2004	Drop D	mute	1970-01-01
Fortress	Queens of the Stone Age			5:37	Villains	2017	E Standard	mute	1970-01-01
Fortress	Tomoya Tomita, Misaki Asada			2:50	Yoshi's Woolly World: Original Sound Version	2015	E Standard	mute	1970-01-01
Fortress (Album)	Protest The Hero			42:06	Fortress	2008	Bb Standard	mute	1970-01-01
Fortress Around Your Heart	Sting			4:48	Dream Of The Blue Turtles	1985	E Standard	mute	1970-01-01
Haunted Fortress	Mike Morasky			1:30	Team Fortress 2	2010	E Standard	mute	1970-01-01
KABANERI OF THE IRON FORTRESS	EGOIST			4:57	Koutetsujou no Kabaneri OP Single - KABANERI OF THE IRON FORTRESS	2016	E Standard	mute	1970-01-01
Marine Fortress	Vangough			3:44	Game On!	2010	D Standard	mute	1970-01-01
Our Fortress Is Burning II - Bloodbirds	Agalloch			6:24	Ashes Against the Grain	2006	D Standard	mute	1970-01-01
Our Fortress Is Burning...I	Agalloch			5:25	Ashes Against the Grain	2006	D Standard	mute	1970-01-01
Questlords of Inverness, Ride to the Galactic Fortress!	Gloryhammer			5:25	Space 1992: Rise of the Chaos Wizards	2015	D Standard	mute	1970-01-01
Storm the X-Naut Fortress!	Yoshito Hirano, Yuka Tsujiyoko			2:04	Paper Mario: The Thousand Year Door Original Soundtrack	2004	E Standard	mute	1970-01-01
Team Fortress 2 Main Theme	Mike Morasky			1:12	Team Fortress 2	2010	E Standard	mute	1970-01-01