ONE (5 4) / TWO (3 6)
Can’t get IRS paperwork done?
Try their video game; it’s more fun!
Look for TWO (refund credits)
With three e-file edits.
Ten-thousand will earn you a ONE.
Comments may contain spoilers. For information on solving transposals and other “flat” (verse puzzle) types, visit the National Puzzlers’ League’s Online Guide to the Enigma.
life as a puzzle 
I can hear the six notes in my head.
It’s funny: the melody that originally came to mind to me is four notes, but your six-note version (from SMB presumably) is probably the most well-known example of that type of melody.