No, you cannot catch a virus because of the exact reason cynprz stated: you are purchasing the song, not downloading it. There is a difference because the site you are purchasing the songs from are a direct source whereas downloading things could be from unknown or a third-party source where a virus may have been picked up along the way.
I'm sure there is a way to transfer songs from your iPod to your MP3 player because I know for a fact that songs can be transferred between iPods and iTunes (my husband buys a song and then transfers it to me so we only have to buy it once). I don't know how to go about it, though, sorry.
I'm sure someone may come along who will know how.
Have a great day!
at 10:58 AM on May. 29, 2009