Christopher Rouse: Symphony No. 1
"Absolutely, I've always rather enjoyed paying homage to the composers I admire, and here I've tipped my hat to a number of composers I revere as experts in adagio writing. As far as direct quotes go, the clearest is a reference to the opening theme of the Adagio from Bruckner's Seventh Symphony, played there and here by a quartet of Wagner tubas."
My thanks to Al Kemp for this information.