Edward Elgar composed his Variations on an Original Theme for Orchestra ("Enigma"), Op. 36, commonly referred to as the Enigma Variations, in 1898?99. It is a set of fourteen variations on a hidden "theme" that is, in Elgar's words, "not played". It is Elgar's best-known large-scale composition, for both the music itself and the enigma behind it. Nimrod is the 9th variation from this.

Duration: About 3 minutes 30 seconds

Diversions is a work by Canadian composer Elizabeth Raum for Trombone quartet written in 1998 for the Aurora Trombone Quartet. Elizabeth Raum's writing is influenced by the school of the tone poem in that her music seems often to tell a story.

Diversions consists of several sections, each with its own personality. It opens with a signal call from the first trombone that is answered in turn by each of the others. This leads to the first rather contrapuntal theme combining the Baroque with the Romantic; then a bridge consisting of variations on the signal brings us to the second theme of three muted trombones playing a lively dance-like accompaniment to the open sound of the first trombone. The continuity of the dance is interrupted by occasional asides or "diversions."

Finally, all four instruments, unmuted, join together bringing the piece to a rousing finish. This work of about 6 1/2 minutes in length is appropriate for advanced performers.