I'm in the process of getting a Will drawn up with a solicitor, who are also named as the Executors, in which i will explicitly state that i do not want any sort of funeral, so eg a direct cremation, and ashes disposed of by the crematorium and not returned to my next of kin.
In the UK the executor of the Will is responsible for arranging the funeral. If you dont name one, by default the executor is your next of kin, who can do whatever they like. They don't have to follow your wishes if they choose not to.
So no tunes for me.