Colombian singer Juanes closed out the Festival of Families event in front of Pope Francis and an admiring throng of thousands to the pontiff’s first day in Philadelphia.

The singer, who joined the Pennsylvania Girlchoir and the Keystone State Boychoir sang in both English and Spanish: “This world needs more love. This world needs more love. This world just needs more love.”

Juanes was part of an all-star lineup led by Aretha Franklin and Andrea Bocelli. The festival included song, prayer and testimonials from people from different continents on the joys and challenges of family life, including an Argentine couple celebrating their 60th wedding anniversary.

After each family spoke, the pope greeted and spoke with them, and later addressed the crowd at length about the importance of families, urging people to take special care of children and grandparents.

"In the family, there are difficulties, but those difficulties are overcome with love," he said through an interpreter. "Love is about celebration, love is joy, love is moving forward."

Folk singer Marie Miller and American rock band The Fray also performed at an event hosted by actor Mark Wahlberg.

Wahlberg credited his Catholic faith and a parish priest for turning him around after a rough upbringing in Boston that included cocaine addiction and a series of racially motivated attacks as a teenager.

"I attribute all of my success to my Catholic faith," he told the crowd. "My faith has given me the ability to be a good father, a good husband and most importantly a good person."

Franklin, best known for her hit "Respect," performed "Amazing Grace." The 73-year-old had said earlier she planned to present Francis with a gift: a box set of sermons by her father, civil rights activist and preacher C.L. Franklin. She later came out and performed "Nessun Dorma" from the opera "Turandot," which she intended as a surprise, but the pope had left by the time of her encore.

Bocelli, whose rendition of "The Lord's Prayer" was accompanied by The Philadelphia Orchestra and the Philadelphia Heritage Chorale, has described Francis as "a blessing given to the world."

"This journey represents for the United States a precious opportunity to embrace this giant, a man of God, a gift from heaven, a point of reference and a providential source of hope for our world," he said. Bocelli also performed another piece after the pontiff left.

Before Francis' arrival, Sister Sledge performed a special rendition of the hit "We Are Family," adding another gender to proclaim, "I've got all my sisters and my brothers with me," and referring to Jesus as "the way, the truth, the light."

Comedian Jim Gaffigan also entertained the crowd before the pope's arrival. The 49-year-old Gaffigan attends Mass weekly with his wife and five children and regularly references his Catholicism in his stand-up and on his TV Land sitcom.

Based on reporting by The Associated Press.\

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