mp3carrotsearch engine will offer you a wide list of mp3 proposals which will help you to get your desired mp3. Write your own search words or pick one of the autocomplete suggestions.
Alternatively, you can paste a YouTube URL in the search box and click the appearing "convert" button.
Once search process is complete, you'll be able to choose your wanted mp3 from the list. After clicking the mp3, you will have the option to listen to the mp3 by clicking on "Play" button or download the mp3 by clicking the "download" button.
When downloading the file, a loading carrot window will show up until the file is ready for download, DON'T CLOSE THAT WINDOW!
Finally, make sure the title of the mp3 is matching your choice and click "Download Now" to download the mp3 file.