I HAVE TUNES!!! After another call or 2 to my local BMW dealer, I decided to give the above e-mail a try (firstname.lastname@example.org). They asked for additional info (beyond merely the serial number) and for a small, very reasonable fee, sent me back the correct radio code!!! Same day! Many thanks to Ivanhoe1997 for posting the contact info! ...and to everyone else that replied with helpful info!