I have to say that Music Mix sounds good for me, as I would love to hear music with my contacts, but it has some limitations, like:
Currently only available in the US, France, Germany, Japan, and the UK. ->And the rest of the world???
Requires WMP 10, which is available for Windows XP and up.
About WMP 10 I had problems when I resolved to restore to WMP 9, so I'll not (so early) try againg WLM 10...
The 1st one is the most "strong" explanation...
/ 
