I'm sure we've had a thread on this - finding it is another question....

I've heard several musical settings of The Highwayman. The one by Phil Ochs has been mentioned in this thread, and another very good one is by Loreena McKennitt, also recorded by Andy Irvine.

Sandra linked to Chris Kempster's collection of musical settings of Henry Lawson poems. There was a tribute album to Chris Kempster a few years back which has recordings of several of these songs. Also Priscilla Herdman's album, Water Lily, has several settings of Lawson poems.