text: Yo, check it out, I got a study to share
  Comparin' dopamine receptor agonists, beware
  Pramipexole, known as PPX, and pergolide, PRG
  Add-ons to L-dopa therapy, let me take you on this spree
  
  We had 41 patients, no dementia, you see
  25 men, 16 women, all with PD
  Mild or moderate depression, that's the deal
  Advanced Parkinson's got 'em, it's real
  
  Blinded observer, checkin' the score
  Montgomery and Asberg Depression Rating Scale, no bore
  We measured MADRS and Zung, depression's plight
  Motor symptoms, complications, daily livin', all in sight
  
  Open-label design, no secrets to hide
  Zung scores dropped in both groups, side by side
  No statistical diff', that's what we found
  Depressive symptoms decreased, ain't messin' around
  
  MADRS scores, though, only in the PPX crew
  Significantly decreased, that's what they do
  UPDRS scores droppin', both groups the same
  Comparable daily dose, no one to blame
  
  L-dopa dose, it went down low
  Significantly for both, yo, that's how it goes
  But the PRG group, it made a bigger slide
  Statistically more pronounced, no need to hide
  
  So there you have it, our results so clear
  Antidepressant effect of PPX, let's cheer
  But PRG, we can't conclude just yet
  More research needed, that's the bet