% find . -regex '.*.[Mm][Pp]3$' > VEGAN.m3uThe "new" thing I noticed was that if I selected the "VEGAN.m3u" in the Finder.app and clicked on the preview, I could play the songs! In the right hand side you can choose the number of the song in the playlist. If a song ends, the next song is started. So, Finder.app is a "poor man's MP3 player"!
For some reason this only worked with mp3s on the hard drive, i.e., ~/Music/; the MP3 CDs didn't work through Finder. If someone can solve this final mystery...

