SnesMusic
http://itunes.apple.com/us/app/snesmusic/id363451148?mt=8
Support : croissantprod@gmail.com
SnesMusic is a music application, it plays rsn files (spc compilation in a rar archive)
you can find RSN files here http://pantyland.free.fr/ or http://www.snesmusic.org/v2/ or http://ocremix.org/games/
To add files into app you have to use Itunes files sharing http://support.apple.com/kb/ht4094
or you can download files with safari on your iphone but http://www.snesmusic.org/v2/ seem to have a bug with safari
For support on it : croissantprod@gmail.com