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
2030	Radio ChaCha			3:44	Radio ChaCha	2010	Drop D	mute	1970-01-01
21 Guns	Green Day			5:25	21st Century Breakdown	2009	E Standard	mute	1970-01-01
21 Letters	Delta Sleep			5:23	Twin Galaxies	2015	E Standard	mute	1970-01-01
21:13	Coheed and Cambria			9:49	In Keeping Secrets of Silent Earth: 3	2003	Drop D	mute	1970-01-01
21st Century	Red Hot Chili Peppers			4:22	Stadium Arcadium	2006	E Standard	mute	1970-01-01
21st Century	Red Hot Chili Peppers			4:25	Stadium Arcadium	2006	E Standard	mute	1970-01-01
21st Century Breakdown	Green Day			4:43	21st Century Breakdown	2009	Eb Standard	mute	1970-01-01
21st Century Digital Boy	Bad Religion			2:52	Against The Grain	1990	E Standard	mute	1970-01-01
22 Acacia Avenue	Iron Maiden			6:39	The Number of the Beast	1982	E Standard	mute	1970-01-01
225	New Model Army			4:52	Thunder And Consolation	1989	E Standard	mute	1970-01-01
22:22 - Nihil	Ghost Brigade			5:52	Isolation Songs	2009	D Drop C	mute	1970-01-01
23	Blonde Redhead			5:20	Studio album by Blonde Redhead	2006	Custom Tuning	mute	1970-01-01
23	Jimmy Eat World			7:18	Futures	2004	Drop D	mute	1970-01-01
2350	Girls Dead Monster			4:26	Angel Beats Perfect Vocal Collection	2017	E Standard	mute	1970-01-01
24 Hours	The Sounds			2:44	Dying To Say This To You	2007	E Standard	mute	1970-01-01