This is the 202nd most frequent Catalan word.
sigut
"Sigut" is the past participle of "ser," meaning "been."
Here, 'sigut' is the past participle of 'ser' (to be), used with the auxiliary verb 'he'.
He sigut molt feliç avui.
I have been very happy today.
'Sigut' refers to the state of the concert emphasizing the experience.
El concert ha sigut increïble.
The concert has been incredible.
In this sentence, 'sigut' is used in a conditional construct to express a hypothetical or unrealized situation.