Here's my transcription from a recording at YouTube.

[I am unfamiliar with Australian cowboy jargon, so there could be errors (although Slim's enunciation is quite good).]


ONCE WHEN I WAS MUSTERING
Slim Dusty

[YODEL]

1. Once when I was musterin', out Carnarvon way,
I had a mob of musterers a-workin' night an' day.
Well, when the mobs were restin', you wouldn't hear a sound,
But when they started movin' you could hear all around:

CHORUS: Hey, sketch 'em out, fetch 'em back, turn the leaders round,
Then come behind, come behind, come behind, you hound.

2. Oh, we were under contract to run the scrubbers there
In amongst the gorges, the caves an' prickly-pear.
We'd bulge 'em through the timber to sweeten down the plain,
And if we saw a Mickey break, we'd yell this old refrain: CHORUS AND YODEL.

3. I had a dog called Bluey, a terrier called Dot,
An' if I ever wanted them, well, they were on the spot.
They'd trot along beside me, as quiet as fallin' snow,
An' you could see them strainin' when I'd give the word to go. CHORUS.

4. We'd box 'em in the big yard an' draft 'em through the pound.
We'd hit 'em with the red-hot brand an' leave 'em safe an' sound.
We didn't mind the sweatin' or workin' rather hard,
But, boys, you'd hear a swearin' when they broke out of the yard. CHORUS AND YODEL.

5. Our beards were gettin' curly before we left that run,
But the boys they liked it tough, an' sure had lots o' fun.
Now, if you were to ask me what stood out on my mind,
Well, if you'd like to wait a tick, I will soon unwind. CHORUS.