You could simply use your MacBook to play the file.
I'm from the last century and none of my portable or living room CD player will play a MP3 downloaded track I have burned from iTunes Version 10 6.1 7—64 bit.
Where did you donwload this track from?
If you purchased it from the iTunes store, it is AAC, not MP3.
Is there some reason you need it as an MP3?
You can easily convert iTunes purchases to MP3 or you can simply burn a regular audio CD that will work in any regular CD player.
To burn an audio CD, add the song to a playlist, then File > Burn playlist to CD and make sure you select AudioCD.
Also note that older CD players may not even be capable of playing a CD-R or CD-RW (CDs that you burn yourself).
VOILA! Of all the discussions I read on this subject, your resolution instructions of 'To burn an audio CD, add the sone to the a plaulist ...' was the easiest and most logical instruction of them all. I have never burned a song to a CD before hence my lack of knowledge. Nor was I aware about a song being on a playlist. I only referred to the Library. Now I am aware of I can burn several songs onto one CD. Am I that outdated? Yes! I tend to purchase CDs and play them either on my computer or living room player. I have not downloaded a single track off the internet then put it on a playlist to burn to a CD. I have moved into the 21st century! With your help!
I am now more fully aware of how iTunes works. I thank you so much for providing all the information to assist me with the burning of one song I needed to use for my Sunday School class for teaching purposes.