Custom Label in Django Formset

How do I add custom labels to my formset?

<form method="post" action="">

    {{ formset.management_form }}
    {% for form in formset %}
        {% for field in form %}
            {{ field.label_tag }}: {{ field }}
        {% endfor %}
    {% endfor %}
</form>

My model is:

class Sing(models.Model):
song = models.CharField(max_length = 50)
band = models.CharField(max_length = 50)

Now in the template instead of the field label being 'song', how do i set it so that it shows up as 'What song are you going to sing?'?