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
Ground Theme	Koji Kondo			3:06	Koji Kondo	1986	E Standard	mute	1970-01-01
Underground Theme	Kenta Nagata, Shiho Fujii			2:20	New Super Mario Bros. Wii OST	2009	Drop D	mute	1970-01-01