Mastering

Hello. I am interested in mastering my single for CD and radio play. The music is an instrumental acoustic amalgam of rock, world, latin and blues all expressed through the acoustic and classical guitar.The song peaks at around 4:30 minutes and is set to be released end of September. The song is currently in the final mixing stages. I would appreciate if you could provide samples of acoustic songs being mastered. Thanks. All the best Christos