How to start a List<Task> in parallel?

I have an object that returns a System.Threading.Tasks.Task:

public class MyClass 
{
    public Task GetTask(object state, CancellationToken cancellationToken)
    {
        return new Task(Execute, state, cancellationToken);
    }

    public void Execute(object context)
    {
        //do stuff
    }
}

Elsewhere I have a List<MyClass>, so I do the following to get a List<Task>:

var myTaskList = myClassList.Select(p => p.GetTask(null, cancellationToken)).ToList();

Now that I have the List<Task>, how can I start them all in parallel? Is there a more concise way to code this?

Thanks!