My take on the Alpha vs Leader thing was something like;
Alpha = rule by brute force; people follow him because they have to.
Leader = someone people follow because they want to.
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Yeah; you're right, you've got to mix the intelligent decisions with a little emotional thinking . . .
After all, music IS emotion, and we musical-type guys are a real emotional lot, huh?
I guess a good band leader has to try to find a happy medium among all the possible choices of what to play, where to play, how to play, etc, etc.
A good leader might stop the band from doing anything stupid . . .
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But, you're right; without taking a calculated risk now and again, we can stagnate . . .