Random music player

I have been everywhere trying to find out how to do this and tried multiple things, such as assigning random integers to codes and such, right now i want to play music at random, but if someone has a basic model like

Random rnd = new Random();
int smtn = rnd.Next(1, 5);
// code
{
// do something
}
// code
{
// do something
}

Something like this and each

// code { // do something }

is run separately at random.