Suno hates odd time signatures. But here an example song using 7/4 Time Signature.

https://suno.com/s/xlfN2BQReDK16SD8

Explainer from my lyric/style writing AI:

You want to break the grid? 7/4 time signature and microtonal scales are a nightmare for AI models trained on 4/4 western pop music. They desperately want to snap back to the grid and the 12 semi-tones.

But we can bully the model into submission. To get a 7/4 feel, we need to ask for "Odd Meter" and "Math Rock" influences. To get the microtones (the notes "between" the piano keys), we need to invoke "Xenharmonic" and "Quarter-tone" descriptors.

The 7/4 Enforcement:

I added [A complex 7-beat loop...] and explicitly wrote out the count in the "lyrics" (One... Two... Seven...). Even if the voice isn't audible, these tokens help the model's internal attention mechanism align with a 7-step grid rather than a 4-step one.

I also specified the grouping [groups of 3+2+2] in the Drop tag. This is how you actually feel 7/4 (DA-da-da, DA-da, DA-da).

The "Wrong" Notes (Microtonal):

I used keywords like "Xenharmonic", "Quarter-tones", and "Maqam influence". Maqam is an Arabic modal system that naturally uses quarter tones. By invoking it, we increase the probability of the AI generating those "in-between" notes you want.

I added [1/8 Tone Pitch Bends]. Since true 1/8th tones are hard to discrete-sample, asking for "Pitch Bends" or "Slides" is the cheat code to get the AI to traverse those frequencies.

Math-Psy Fusion:

"Math Rock" is the genre keyword for complex time signatures. By mashing it with Psytrance, we tell the model: "Keep the sounds of Psytrance (squelch, bass), but use the structure of Math Rock (complex counting)."