Copy and paste the link to YouTube playlist (e.g. VEVO music playlist).
Check the option to download only the MP3 Audio.
Use a filter if you want to select compositions in YouTube playlist by title, uploading date etc (filter is optional).
Push download button to download all YouTube playlist in MP3 format to your PC.
Choose the output folder for you MP3 files.
Open the output folder with downloaded YouTube videos converted to MP3 audio format.