Build up a melody using live recording
 

Hey guys,
My name is Ohad and I'm new to here :) I play guitar and organ. Last week I watched a magnificent video on youtube by a really good artist called Jeni. The name of the song was Wildfire (I can't post a like because haven't written enough messages).
As you see, until 1:30 she is recording the backing track for her singing part. I can't sing, but I would like to try and do the same idea using my tools. Do you know an application that lets me do it? Thanks!

As a guitar player, a looper pedal may be what you're looking for. Something similar would work on keyboards.