In the past I’ve used Napster for downloading music where by I pay a monthly fee rather than per song, if I don’t pay the music stops playing, which suits me.
But only certain devices are supported and the wife’s just got an Ipod which isn’t so is there anything similar in terms of monthly subscription of downloading music that will work on an Ipod? Or is it a case of paying per song?

Have a look at emusic.com