Btw, I think that in the YouTube/torrent era there's no such thing as "unreleased" material anymore.Anything can be found and what's put on an album doesn't matter anymore because hardly anybody buys them .So, all a so-called music fan does is to scan through YouTube and find loads of music from an artist and that viewer could find anything from singles to album tracks to unreleased songs to demos...everything.

Sweet and Tender Hooligan and Handsome Devil by The Smiths.
Two of their greatest songs imo but managed to get 'em on a Peel sessions bootleg so yay!

Alchemy by Chris and Cosey too, it's a cracking tune but doesn't seem to be available anywhere other than Youtube unfortunately.

Lady Gaga - No Way
Lady Gaga - Nothing On (But the Radio)
Lady Gaga - Animal
Lady Gaga - Oh Well
Lady Gaga - Let Love Down
P!nk - Why Did I Ever Like You

Another Kelly Clarkson one - Beautiful Disaster Live.

That's on Breakaway

The Sound of The Smiths has both of those on it if your bootleg one isn't great quality.

Girls Aloud - Memory Of You

And I don't think I'd want it to be on an album actually, I like that it is a hidden gem.

Kate Bush

Be kind to my mistakes
You want alchemy

Leona - Scene of the Crime.

Another vote here for Madonna's 'Supernatural'. Lovely song.

Also, can't believe I'm saying this, but an Oasis B-Side to Roll With It (I think). Song called 'Rocking Chair'.
I'm no great fan of there's, but it's an excellent song.

Oh excellent! Mine is pretty shoddy quality so I'll definitely be ordering a copy.
Theres so many Smiths compilations with the same tracks I just don't bother looking anymore.
Thanks a lot!