But playing background cocktail music and light dancing to 200 ppl is utterly different to playing upfront dance, show and disco music to 200 ppl. The number doesn't matter a damn. The VOLUME does. The age and needs of the audience does. The type of music you play does. The venue does.

But the number of people is immaterial.
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An arranger is just a tool. What matters is what you build with it..!