M.I.A. just released "27", it's an unfinished demo, but it seems appropriate that she release this one today and dedicate it to Amy. Check out her Soundcloud page and you can see the lyrics, along with a message:
Dedicated to all my friends that died at 27.
She tweeted: “i recorded this song B4ickileekx and never put it out. its a unfinished demo. R.I.P A.M.Y.
27 by _M_I_A_