Ups and downs. This and that. Yin and yang. Then there's sales and marketing. Because you have the whole thing backwards.
Marketing comes first.
Sales efforts follow to complete the one-two punch. If you attempt to do sales before you've properly done marketing, you'll come up short. If you choose to focus on one activity but not the other, you also lose in the long run. To succeed financially in the music business, both marketing and sales must take place. And take place in that order.