This is the 12647th most frequent Russian word.
концертом
"Концертом" means "concert" (instrumental case of "концерт").
In this sentence, 'концертом' is an instrumental case form of the noun 'концерт' meaning 'a concert', used to indicate the means or the activity during which the action of the verb (enjoy) occurred.
Мы наслаждались концертом весь вечер.
We enjoyed the concert all evening.
Here, 'концертом' (the concert) is also in the instrumental case, utilized to describe the characteristic by which the hall is famous.
Этот зал славится своим отличным концертом.
This hall is famous for its excellent concert.
In this example, 'концертом' is aligned contextually with the content the person reflects on, demonstrating its variability in different cases across contexts.