CALI, Colombia (AFP) - A Colombian nun will showcase her rap prowess for Pope Francis when he visits her country this week.

Maria Valentina de los Angeles is one of a group who will sing the official song for the Argentine pontiff's visit as he greets the crowds.

It is "an opportunity to show him our love the way that we know, which is through music", the 28-year-old said.

She performs a rap interlude among the cheerful Latin beats of the song Let's Take The First Step by the United Catholic Musicians.

The ensemble, which headhunted her after she won a reality-show competition on television, invited her to compose and perform the rap interlude.

Pope Francis will visit Colombia, a Catholic country of 47 million people, from Sept 6 to 10. He is credited with aiding a peace deal signed last year between the government and a leftist rebel force after half a century of war.

Maria Valentina likes the rebellious spirit of rap.

For her, it chimes with Pope Francis' own call to the young to "make trouble" - his way of telling them to fearlessly share their faith.