Sustaining a band like the Beatles is very similar to sustaining the momentum of a startup. You have to all be on the same page. You all have to be playing in harmony and you all have to be moving towards creating something different, unique that people actually want. I like to look to the Beatles from time to time and look at the energy that band sustained over a very long period, from 1968 to 1970.
If you look at GE or General Electric, they have been on the public markets, lasting longer than any other company on the stock market.
I see startup teams very similar to sports teams or like high energy bands.
( This blog post is a work in progress. )