On the Today programme this morning, it was claimed (though immediately clarified) that the M1 was the first motorway in the country. I don't think so! I think you'll find that the M6 Preston bypass was the first stretch of motorway to be completed in the UK, opened by Harold Macmillan in 1958. The BBC's web article is better!
Lancaster City Museum had a good exhibition to mark the anniversary, but it didn't seem to warrant the national coverage given to the M1's anniversary. Of course the M6 doesn't go anywhere near London, so that probably explains the lack of coverage.
Trawling the archive, I see that there was a story on the BBC news site in December, but I don't remember it making national radio, or spawning a musical!