There are plenty of cases wherein we would need to convert music from one format to another so that we could play it on different devices - this can be a real pain. Usually you would need to convert it in order to play it on your phone when you download it or maybe you're just converting it in order to reduce the size. Converting Audiobooks Full Tutorial
Of course, it's going to be a pain and that's the reason there are plenty of conversion software's that would help you convert one format to another depending on what you need.

When searching for a converter you should find one that converts music into many formats else like in the past you would need to download several software's and convert them from one format to another until you finally get what you need (not a wise decision).

What you need to do

Before you even begin searching for software to do the job for you, you should think about the final purpose of conversion. Are you just looking for a way to play it on another device or are you trying to compress it to the maximum extent as well?

Also when converted to a few formats the sound quality would be lost and hence you would need to make sure that you're wise in your decision. Most devices would be able to play at least 3 - 4 different formats, hence pick the one that's the best.

The most popular format of music that you can find today is the mp3, so whenever I decide to store something I convert it into this format as the size is perfect and at the same time the overall quality of the music and video isn't altered.

Should you opt for premium or use free software?

This is another question that you should ask yourself. Are you going to be mass converting music from one format to another or is it going to be something that you do just every now and then?

Most of the free software out there would allow you unlimited conversions, but you wouldn't be able to convert more than one file at a time. This isn't a problem if you're just converting 4 -5 files; but, imagine doing this for 100!