Music for 63 videos: 9 briefs, 3 takes each, $3.375 at 12.5 cents

Music 1.0 on Sume costs a flat $0.125 per generation, and the model has no duration parameter, so length is steered in the prompt. That makes the number of generations, not the number of videos, the cost driver. Sixty-three videos that share 9 briefs need 9 tracks, or 9 x $0.125 = $1.125; if you generate 3 takes per brief and keep one, it is 27 generations and $3.375.

Three ways to cover 63 videos

Music 1.0 runs on Google Lyria 3.5 and makes structured songs of up to a few minutes, per the Music 1.0 doc. Price below is the flat generation fee only.

The cost is small; the choice is creative

The gap between the cheapest and most expensive strategy is $6.75. Compared with video footage, where one 8-second Seedance 2.5 clip at 720p is $4.6224, a full music library for all 63 videos is under two clips.

So spend the difference on takes. A brief that names tempo, key and one named moment (the doc lists seven axes) produces a track you can reuse across a series, and three takes of the same brief give you a choice at $0.25 extra per brief.

Per-video cost and retention

Nine tracks across 63 videos means seven videos per track, so the music line is $0.125 / 7 = $0.0179 per video. With three takes per brief, it is $0.375 / 7 = $0.0536 per video. Neither number moves a video budget.

What moves the outcome is retention. Store each chosen track's URL against its brief and reuse it, because a second generation of the same brief is a new $0.125 charge and a different song. Keep the three rejected takes for a month in case the client changes the brief; they cost $0.25 per brief and nothing to store.

Music 1.0 also accepts an optional image for conditioning, which does not change the flat price in the catalog. Test one conditioned track against one prompt-only track on the same brief before you adopt either for all nine.

Where the cost does matter

Two cases change the picture: a pipeline that generates music per video in a loop with no cache, and an agent that retries on a vague quality judgment. Cap the number of generations per brief in code, store the track URL against the brief, and the line stays rounding error.

A cap you can enforce

Put the music budget in code so that no loop can spend more than planned.

• Cap generations per brief at 3, which is $0.375 per brief.
• Cap total music generations per campaign at 27, which is $3.375 for the nine-brief plan.
• Refuse a new generation if a track URL is already stored for that brief.
• Record the prompt next to the URL; the prompt is the only way to remake a track you liked.