karaoke microphone version 2.0

About me: I am only an idea guy. I have a lot of ideas and this one is the simplest to do.
I am proposing a Karaoke Microphone where it uses the cheap and easy to buy MMC cards as storage of songs. Current Karaoke Microphones requires users to purchase high-priced proprietary non-standard memory chips pre-loaded with songs that is only available in shops that sells Karaoke Microphones.
Where can users get songs? By Downloading it from an internet website with yearly subcription fees.
How can we prevent sharing of files? Each Karaoke Microphone sold will have a 1st year free subscription and the Karaoke Microphone is the registration requirement that they have to register.
AND?
And this microphones have unique ID's and files or songs they download are encoded with this unique ID's that will only play on the registered Karaoke Microphone.
Advantages:
This can drive the price of the Karaoke Microphone lower thus making it available to more people.
Instead of pre-packaged,pre-loaded songs on high-priced, non standard, proprietary memory chips. Songs can now be selected by the users and loaded onto standard memory cards. Again driving the total cost of ownership lower and again making it more attractive to buyers.
A constant source of income from the website subscription. Instead of a one time income from a sale of a Karaoke Microphone and memory chips.
Again this is just an idea and anyone that can help can join.