If I put mp3 files onto a dvd-r, will I be able to copy them back onto an mp3 player and play them normally?

yes you can do, dvd's are just a recording media the same as CDR etc.

Hi,

You need a dvd copy tool to copy your dvd files to another blank dvd.

Try Joboshare DVD Copy.

You can find it here:

http://www.topmediasoft.com/dvd-copy-joboshare.htm...

It can:

1: Copy almost any dvd to a blank dvd with 1:1 quality.

2: Remove dvd menue, select subtitles and audio tracks, or copy main movie separately to create customized DVD.

3: Copy DVD with any region code.

4: Copy DVD movie to ISO file or DVD folder, burn ISO file and DVD folder back to DVD.

It is easy to use and try it now. Hope it can help.

yeah , but you need some software to get it back,such as CD/DVD ripper.DVD Ripper can easily rip DVD to AVI, MKV, MP4, WMV, MOV, MPG, MPEG, 3GP, 3GPP, MPG, ASF, FLV, VOB, WMA, M4A, MP3, etc. with super fast speed and high quality.

http://www.rip-dvd.org/

here is the mac version

http://www.dvdrippermacos.com/