[B]I use packet writing software such as DirectCD from Adaptec and DLA to do this. I drag and drop flies on to my CD and they play in my MP3 players just fine. When I get bored of any songs, I can replace only those leaving the others intact. The Quick Erase feature in these software can wipe clean the CD if you want all files gone. Of course, the very first time, you have to do a full format using the corresponding software before you drag and drop.
If you want the songs to play on regular CD players, then simply use the burning software's native erase function and burn the songs on. Of course, you can erase the songs on an ongoing basis. You certainly don't need to buy any more - I have been using just 2 CDRWs for this function for the past 3 years.[/B]