Systematically presented thought on music by JPII?

This article from the National Catholic Reporter confuses me just a bit -- I've read B16 on the topic, (and just because he didn't head some page "my systematic thoughts on music, doesn't mean he hasn't,) but where did John Paul II do this, as the article claims, or at least implies he did?

Much has been made of Pope John Paul II’s role in inspiring the music of the new evangelization. But what of the man who has led the Catholic church since 2005?
According to Fr. J. Michael Joncas, Pope Benedict XVI’s thoughts on liturgical music “have never been presented in a systematic fashion.” But some of his opinions can be gleaned from books like The Spirit of the Liturgy, which compiles his writings on the subject. They reveal an abiding respect for traditional sacred music, and greater uncertainty about more modern styles.
When Benedict XVI came to Washington and New York to celebrate his first U.S. Masses in April, the visit triggered more contentious debate about music in the liturgy. Traditionalists in particular were confident that this pope would share their tastes, if not their convictions.
The music chosen for the Mass programs in the two cities formed a contrast. In New York, the Masses at St. Patrick’s Cathedral and Yankee Stadium favored what Joncas characterized as a “more substantial use of chant … and choral singing without congregational vocal participation.”

And I guess it's good that Fr. Joncas at least implicitly acknowledges that participation is not inherently vocal...
But who knew the famous "Three Judgements" were now four in number? (Apparently, we must ask, is the music appropriate liturgically, aesthetically, pastorally and HOSPITABLY?)