Hmm, still doesn't work sadly.
I'm playing around with v1.2 (latest release), I'm in the MainMenu.xml, playing with the "music" attribute, which from the start has the value of "track1,track2".
I added a music fil (.wma format) to the Content project in Audio/Music/track1.wma. I checked that it actually set the Content Importer to "WMA Audio File" and the Content Processor to Song - XNA Framework.
So, according to your guidance, I should be on the right track :)
So, I hit F5, game starts and there is no music. The sounds are there, but no music.
I try to change the value of the music attribute to only one track, so now it's music="track1" in the MainMenu.xml - then I get this error:
"Song playback failed. Please verify that the song is not DRM protected. DRM protected songs are not supported for creator games."
The file should be DRM free, so I don't see why it prompts me with this...
I tried with a .wav file too, same error, but I could see in the debugger that is were looking for a .wma file....it should support .wav and .mp3 too right?
Can you help me here...can't get it to work... :(