Chloe-chan,
I've been looking for that Gaara song everywhere! It reminds me of a music box, and it played when Gaara was remembering Yashamaru and his childhood.
Sadly, it hasn't been released anywhere yet.
But, I did find a MIDI version of it here:
http://perso.wanadoo.fr/muushi/indexone.html
Just click MIDI on the left column, then scroll all the way down to "Gaara (ep77)."
Hope that helped! :)