A CD "audio disc"*** has specifications for format and structure. When you use your burning program to create an "Audio CD" it will meet these specifications and format and should play in any CD player. The software will take care of the conversion for you. However a 4 minute track is like 30MB.
When you burn as MP3/WMA you're creating a data disc. Those audio formats is compressed and you can fit many more hours on a CD but it's only going to play on CD players designed to play it. There's no specifications but usually just burning it as a data disc is all that is needed but you'll have to check the manual for he device on exactly what it expects.
***While on the topic you might see "Audio CD's" in the store but they are no different than regular CD with some minor exceptions. They have a tax applied which goes directly to the MPAA which is why they cost more. Standalone CD recorders also have this tax applied and will reject any disc without the "Audio CD" mark. This tax on the discs and recorders is why they aren't made in mass quantities. Unless you have standalone CD recorder it's pointless to buy such discs.
A .m3u file or playlist is simply a list of audio resources. For example if you put 100 songs on a CD you might want to specify the order they play in. Any software player could create one of these lists for you.
This particular one is generated randomly:
http://www.40lbhead.com/headradio/list/randomlist.m3u- Code: Select all
http://www.40lbhead.com/headradio/wma/fuse.wma
http://www.40lbhead.com/headradio/wma/I_lie_to_me_you_lie_to_me.wma
http://www.40lbhead.com/headradio/wma/optimism.wma
http://www.40lbhead.com/headradio/wma/faker.wma
http://www.40lbhead.com/headradio/wma/the_angry_song.wma
http://www.40lbhead.com/headradio/wma/my_dream.wma
http://www.40lbhead.com/headradio/wma/thank_you.wma
http://www.40lbhead.com/headradio/wma/hidden_track.wma
http://www.40lbhead.com/headradio/wma/climb_high_enough.wma
http://www.40lbhead.com/headradio/wma/1_9_6.wma
http://www.40lbhead.com/headradio/wma/shoulders_of_fate.wma
http://www.40lbhead.com/headradio/wma/target_you.wma
http://www.40lbhead.com/headradio/wma/how_do_you_do.wma
http://www.40lbhead.com/headradio/wma/frustration.wma
http://www.40lbhead.com/headradio/wma/feel_the_sun.wma
http://www.40lbhead.com/headradio/wma/she_knows.wma
http://www.40lbhead.com/headradio/wma/last_time_again.wma
http://www.40lbhead.com/headradio/wma/efforts.wma
http://www.40lbhead.com/headradio/wma/the_empire.wma
http://www.40lbhead.com/headradio/wma/round_the bar.wma
http://www.40lbhead.com/headradio/wma/na_na_na.wma
http://www.40lbhead.com/headradio/wma/no_friends.wma
http://www.40lbhead.com/headradio/wma/the_worm_and_the_toad.wma
http://www.40lbhead.com/headradio/wma/bad_joe.wma
http://www.40lbhead.com/headradio/wma/my_luck.wma
http://www.40lbhead.com/headradio/wma/last_kick.wma
http://www.40lbhead.com/headradio/wma/blindfold.wma
http://www.40lbhead.com/headradio/wma/primitive.wma
http://www.40lbhead.com/headradio/wma/old.wma
http://www.40lbhead.com/headradio/wma/content.wma
http://www.40lbhead.com/headradio/wma/stick.wma
Let's say if your truck had internet connected device. You could just plug the list in and start plying that right now.

In the case of putting it on CD you'd have relative paths similar to this:
- Code: Select all
40lbhead/my_luck.wma
40lbhead/last_kick.wma
40lbhead/blindfold.wma
40lbhead/primitive.wma
Someotherband/somesong.wma