Irala is the author of one of the most consecrated songs in the Catholic medium, the Prayer of St. Francis of Assisi present in the vinyl compact of four songs "Irala Canta" (May 1968). In 2008 Father Irala re-recorded the famous song at an OPA event. The song "Prayer of San Francisco", was used in the novel of Rede Globo, Velho Chico. The campaign 'In whose name, San Francisco?' used the same song with a musical arrangement of Tim Rescala. In 1989, the song was re-recorded by Fagner on the album O Quinze, and in 2003, it appeared in an acoustic version in Ana Carolina's voice on the DVD Estampado. In 2013, the song was re-recorded for the official soundtrack of WYD 2013, in the Heart of the Journey, being interpreted by Adriana Arydes, Eliana Ribeiro, Guilherme de Sá, Sister Kelly Patrícia, Father Fábio de Melo and Father Marcelo Rossi. Still in 2013, an instrumental version was released by the OPA Group.