Generally speaking, music burned to a compact disc is in .wav format, and therein lies the problem of purchasing music in mp3 format and finding that your software can not first
transcode them. (change the files to other formats)
The mp3 format is highly compressed, using a method of extracting from the music all of the sound frequencies which are either beyond the limits of human hearing, or are unnecessary.
The uncompressed .wav file is very large and contains the sound almost identical to the original source.
Solution: A convenient system for transcoding.
There are several such programs available at little expense.
I can highly recommend dbPoweramp, which allows a tremendous range of transcoding, burning, copying, in a user friendly format.
here's a link:
http://www.dbpoweramp.com/I have tried a good number of these type programs from others, but ended up staying with this one.
As for the Nero software suggested to you earlier, it is fantastic, and I strongly recommend it over the Roxio products by far.
However, if your burning software is currently adequate and all you need is to transcode then purchase the dbPoweramp music converter.
You can always purchase a Nero program on ebay for far less than the suggested retail prices offered. Hope this helps.
Bear in mind that you will have to spend a little time reading and familiarizing yourself with how to use these programs (lots of reading just to learn how unbelievably simple they are to use).