Duets are hard because Suno wants one vocalist per song. Random voice-swapping is the default failure — you need to script the handoffs explicitly.
1. Label every section with its singer:
[Verse 1 – male vocal only, warm baritone]
[Verse 2 – female vocal only, soft alto]
[Chorus – both voices together, harmony]
Never leave a section unlabeled or Suno picks whoever.
2. Describe the two voices distinctly. 'Male vocalist' and 'female vocalist' is too vague — they'll bleed together. gravelly baritone male vs clear bright soprano female — maximum contrast keeps them separate.
3. Write the trade into the lyrics. Alternate the lines literally:
[Male] I left the light on
[Female] I never came home
Bracket labels in the lyrics reinforce the section brackets.
4. Expect to comp it. The reliable pro move: generate the male part alone, generate the female part alone (same style otherwise), and stitch them in a DAW. Two clean solo takes beat one confused duet take every time.
5. Keep the backing identical in both generations so the comp sounds like one song.
Good luck! Hank founder of SonorixPG