wrote in message
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I recall years ago, you could buy a device that plugged into any car
radio that played cassettes. The thing was pushed into the casette
opening, and a wire which is part of it, could be connected to any other
audio source.

But what about car radios that have a CD player. Is there a similar
device that can be pushed into the CD opening to allow another audio
source to be played, such as a MP3 player?

Will the CD player play MP3 CDs? If so, burn the MP3s to data CDs; if not,
replace it with one that will.