There's one HUGE difference between an SMF and an arranger version. Should you make a mistake in the phrasing, get lost, come in late, etc, in arranger mode, you SORT of get away with it.
With an SMF, it won't wait for you... Maybe better for getting the song right!
Maybe we could rename this one, 'Don't Wait for me, Argentina'!
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An arranger is just a tool. What matters is what you build with it..!