Channelknight Fadran

Most musicians to use loopers just do them on the fly, so I don't even think prep time would be particularly necessary.

Also here are some other observations I've made:

Most Music Wizard duels would start slow and build up into more crazy stuff. You could start a song by going ham on a bunch of drums and distortion bass, but at that point you've pretty much locked in what kind of tone your song is going to be, and any Motifs that don't fit will become a lot weaker; meanwhile, slowly building suspense and various calls would allow for a much more flexible song with room for all sorts of things.

However, you could also very well finish a Music Duel right away if you start strong - it's a risk/reward play that pits your ability to end a Duel quickly, against their ability to pull you into a song of attrition. Duels would always start with something of a Prisoners' Dilemma, with either party choosing an opener based on how they want to play the duel.

If you both start slow, it'll be a pretty standard battle; if one starts fast and hard, they can quite easily finish the duel in record time, but become vulnerable for longer songs; and if both begin with loud and brazen openers... well, then one could say that the proverbial crem has hit the fan and sliced its head off.

Worldbuilding idea: Motifs are powered by personal Attunement, but some are so well-known that they tend to have preestablished abilities baked into them. Stuff like the opening notes to Beethoven's Fifth or Fur Elise or   Da Da DAN DA  (You feel like you're going to have a bad time) - these are so ingrained into musical culture that just about anyone can learn them, but can't really grow in power as a person Attunes to it due to their semi-objective nature.

OOOOh that's so cool!

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This reminds me of (Marvel multiverse of madness spoiler)

Oh that's weird. Was just talking about that movie earlier today.