A different music bed for every Short: $0.125 a track
Reusing one song under every Short makes a feed sound templated. Sume Music 1.0 costs $0.125 per generation, and Timeline can duck it under your voice.

One loop under every Short is a branding choice, like the logo sting. YouTube's monetization page, read on October 5, 2026, accepts a repeated intro and outro if the bulk of the content differs. A different bed for each episode is a cheap way to make the whole thing sound less alike, and the numbers are small.
What a track costs
Sume's Music docs set a fixed $0.125 per accepted Music 1.0 generation, and the price does not change with prompt length or optional image conditioning. Seven beds for a week is $0.875. The Timeline soundtrack field then places a bed under your spine and supports gain_db, loop, fade_out_seconds up to 10, and duck_db from 0 to 20, which lowers the bed while your voice speaks. Ducking needs a real spine, not silence.
Brief it differently each time
Keep the brief short and change one thing: tempo, mood, instrument. If your Short is a tense reveal, ask for a low pulse. If it is a cheerful demo, ask for a light bouncing bed. Mood that follows the point reads as authored.
What YouTube says about music in Shorts
YouTube's music page for Shorts says that Shorts longer than one minute with an active copyright claim, regardless of the policy, will be blocked, and that the Audio Library offers tracks that will not receive a Content ID claim. The page does not say how a track from an outside generator is treated, so we cannot tell you. Upload a test as unlisted, check for claims, and only then go public.
The disclosure page separately says AI-generated music as the video's primary focus calls for disclosure. A bed under speech is usually not the primary focus; a Short about the song is.
The practice is simple: new bed per episode, ducked under the voice, a quick unlisted check, then publish. At cents per track there is no reason to loop one song for a year.
A weekly routine
On Sunday, write seven one-line briefs, one per episode. Generate the seven beds, listen once, and discard any that clash with the voice. Attach each to its Timeline with a duck of a few decibels so your narration stays clear. Keep the brief next to the finished Short, so you remember which mood went with which idea.
If a track fails, regenerate it. Even three attempts for one episode is $0.375, still less than the value of an hour of searching a library.
Sources
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