its better by far just to listing sirius or xm, and not buy iPods or CDs

Depends on how much you value finding new, independent, or obscure music. MySpace can help with finding it and discovering it, but as far as being able to listen to it in your home, Sirius doesn't have a lot going on that way (though I enjoy their classic alternative station; it's not like I can overdose on the Smiths, Japan, or Bahaus).