I have to play music through microcontroller.
. Actually there are two push button for this, one for music & other for tone
I want to know where to begin
1. I want to make instrument as it is
It's going to take additional hardware to make anything that sounds like a real musical instrument. And since the Arduino doesn't have a DAC, there's no way to get dynamics or generate ADSR.
I recently launched a kickstarter for a couple much more powerful boards.