The best thing you can do whenever your iPod doesn't support the audio file you wish to listen is to convert the song to a compatible format. Programs like Free Music Converter let you convert between audio formats and get rid of incompatibility issues.
Along with its conversion capability, this application offers you some basic audio editing utilities that help you edit ID3 tags as well as trim or join songs with ease. Also, this handy program comes with a built-in audio player and supports popular video formats. You can extract the audio content from your favorite music videos and enjoy listening to them on your mobile phone or iPod.
Although the name of this application states one thing, the program comes with limitations. If you wish to successfully convert audio files larger than 3 minutes, you need to upgrade Free Music Converter to Total Music Converter. Even on the homepage of the developer the program is presented as free, which makes things even more annoying.
Briefly, Free Music Converter provides you with high-quality output files in a very short time. But if you need it for processing larger audio files, like podcasts or music sets, I recommend you to try more advanced audio conversion tools.