Make a radio button

How I can make an in-game radio: press a key to change the music, without taking a lot of resources ?

I found a solution: at the beginning of the scene play all the music on different channels, pause them. and as soon as the player presses the radio button, it changes the music. But, I think that if I load a hundred songs like this, it will drain a lot of resources.

Because of the resources there are preload and unload music file actions.
But I don’t know why hundred channels… why not if the button was pressed play a new song on the same channel or directly without channels?