Questions & Answers about Det var ikke før konserten at bassen fant innsatsen.
It is a very common Norwegian pattern meaning It was not until ... that ....
So:
Det var ikke før konserten at bassen fant innsatsen
= It was not until the concert that the bass found its energy/effort
This structure emphasizes that something happened late, and not before that point.
Here det is a formal or dummy subject. It does not refer to a specific thing.
This is similar to English it in sentences like:
It was not until the concert that ...
So det is mainly there because Norwegian sentence structure requires a subject in this kind of construction.
In this pattern, at introduces the clause that contains the main event.
Structure:
Det var ikke før + time expression + at + clause
So:
- ikke før konserten = not until the concert
- at bassen fant innsatsen = that the bass found its effort/energy
Without at, this sentence would sound incomplete in standard Norwegian.