A simple python script from which you can download the songs by just entering the name. You can also download by entering a list of name, youtube link or list of youtube links.
You can try that online. Here is the link -> http://mp3.amanroy.me
Make sure you have python and youtube-dl installed.
$ sudo apt-get install youtube-dl
For windows download youtube-dl.exe file and copy it in the directory.
$ ./program
This program is tested on Ubuntu 16.04 LTS
Downloading copyrighted material may be illegal in your country. Use at your own risk.