A report for the file likely refers to a collection of string quintets by these two masters, specifically Mozart’s famous cycle of six and Bruckner’s single but monumental contribution to the genre. Wolfgang Amadeus Mozart: The String Quintets

: The third movement is frequently cited as the soul of the work—a deeply spiritual and lyrical movement that rivals the slow movements of his symphonies in scale and intensity.

: Famous for its expansive, majestic first movement.

: Mozart preferred the "viola-rich" texture (using two violas instead of two cellos), which allowed for a more complex, inner-voice dialogue and a darker, more symphonic sound than standard string quartets. Anton Bruckner: String Quintet in F Major