Goolly Gee … I did not mean to start a discussion on Haugen’s Mass of Creation … it was just an example that had enough controversy [Like - Hate] attached to it that I thought the OP would recognize what was meant by “compsed setting” …
And “Sing to the Lord” is easily read [more so then many Church documents], includes theological back ground …
Argue all you want, I choose not to go there …especially when it comes to music … Perfectly phrased or not …
FYI- when it comes to matters liturgical - I will always try to follow my Bishop’s lead rather than an internet poster … and in the hierarchy of liturgical documents - “Sing to the Lord” is far better then many and more authoritative then some and probably better then a summary posted in an internet Forum …
Not everyone that comes to CAF has a Masters Degree in any Curricula - let alone Liturguical Studies, Pastoral Ministry or Theology …

Don’t like my offer of information - offer your own … PAX CHRISTE
The problem is that Sing to the Lord does not carry the recogntio from Rome, and, that is mighty important. Thus, Sing to the Lord is not mandatory, but simply suggestive, like its predecessor, Music in Catholic Worship. Even Built on Living Stones is not a requirement. The document contains suggestions for parishes building new churches, but, it is not mandatory.
It is better to go witih Musicam Sacram, the authoritative document of the Holy See. It might do you some well to read Liturgiam Authenticam, the document which was the starting point for the original version of Sing to the Lord.
You might be interested in reading this power point presentation from the USCCB:
usccb.org/liturgy/MUSIC%20FDLCnew.ppt
This is what Sing to the Lord was originally supposed to be. If you note, even this power point presentation, made by the USCCB Committee on Divine Worship, found some serious problems with a lot of the music. However, the USCCB took a serious detour from the original intent and the result was something that was heavily watered down and does not really say anything. The document, by the way, failed to get the necessary 2/3 vote of the Latin Rite bishops in order for it to be sent to Rome for the required recognitio.
Nonetheless, in the hierarchy of documents, as you stated, Sing to the Lord does not even come close since, as I repeat, it does not carry the recognitio from Rome that would make it mandatory. As I see it, the USCCB let a wonderful opportunity to finally clean up the mess in music go by the wayside.
I was in St. Louis back in November for a work-related meeting, but I managed to get away to attend the Gateway Liturgical Conference. Archbishop Malcolm Ranjinth, who, at the time, was the Secretary to the CDWDS, told me that the Holy See was working on its own document regarding Sacred Music and it should be released some time in 2009. Gven the changes in leadership, it may come sooner, it may come at the tail end of the year. Nonetheless, the Archbishop told me that he knew and fully understood my concerns about the downhill turn that the quality of music here in the States has taken. He was also adamant that paraphrases to the official texts of the Ordinary of the Mass should not be happening. In fact, the CDWDS made that issue perfectly clear when it released the Ordinary so that composers can start working on the settings.