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
Robot Rock	Daft Punk			4:50	Human After All	2005	E Standard	mute	1970-01-01
Robot Tears	Destination Dimension			3:34	Mantodea	2019	Eb Drop Db	mute	1970-01-01
Rock of Ages	Def Leppard			4:01	Pyromania	1983	E Standard	mute	1970-01-01
Rock! Rock! (Till You Drop)	Def Leppard			4:01	Pyromania	1983	E Standard	mute	1970-01-01
Roll The Dice	Beth Orton			5:43	SuperpinkyMandy	1993	Eb Standard	mute	1970-01-01
Rolodex Propaganda	At The Drive-In			2:57	Relationship Of Command	2000	E Standard	mute	1970-01-01
Romance About Tear	Epidemia			6:29	Elven Manuscript: Part 1	2004	Eb Standard	mute	1970-01-01
Romanesque Romancia	Ariabl'eyeS			5:23	Shuugeki no Romanesque	2016	E Standard	mute	1970-01-01
Romantic Rights	Death From Above 1979			3:18	You're A Woman, I'm A Machine	2004	D Standard	mute	1970-01-01
Room at the Top	Adam Ant			4:46	Manners & Physique	2009	Drop D	mute	1970-01-01
Rose And The Spirit	Hiroki Kikuta			1:31	Secret Of Mana OST	1993	E Standard	mute	1970-01-01
Roudou Sanka	Momoiro Clover Z			4:47	5th Dimansion	2013	Custom Tuning	mute	1970-01-01
Ruumiinmultaa	Korpiklaani			3:40	Manala	2012	B Standard	mute	1970-01-01
Ruzgar Gulu	Teoman			3:19	Teoman	2009	E Standard	mute	1970-01-01
Rückkehr	Die Ärzte			2:57	Drei Mann - Zwei Songs	2019	Eb Standard	mute	1970-01-01