What is the most simple scheme for lights on the Arduino?

https://geektimes.ru/post/258424/
And in General - you can do it without Arduino:
antonkozlov.ru/gadzhety/svetomuzyka-svoimi-rukami.html

And so in order to understand the words below, check this out:
Analog inputs
Analog outputs
And so our circuit will flash an led in time to the music.
First, you need to get the data from an analog input (to serve you on the minijack from your phone, but don't forget to put a current limiting resistor. Get Jack one contact to ground and the other on the analog pins).
Receiving data data to an analog output (to the input of the subchain led, don't forget the current limiting resistor)
Ready! You got the simple light-music installation, if you want to improve it.
Any questions can email.
Ps. If the information was helpful, remember to mark as "answer"