Checking incoming text messages for which mp3 to play?

[Skywolf76]

Hello

I have a strange, and probably unusual requirement: I want to leave a phone hooked up to a stereo via the headphone jack. Then I want to be able to send a text message to that phone to trigger a single playback of one mp3 file (which is stored on the SD card of the phone).

Is there any app around that does that? Would anyone beside me want to use the phone for such a silly thing? Would it be hard to write such an app?

Thanks anyway

Skywolf