There is a week to go before the big premiere of “La gata perduda”, and this episode begins with the first rehearsal of the amateur singers on the stage of the Liceu. The test result is not very good. Five days to sort out the chaos. From here begins a frenetic routine of rehearsals, morning and afternoon, in which the difficulties accumulate. Chapter 4 is a constant building up of small problems which keeps getting bigger and bigger. The conductor, the stage manager and the choir coordinator are solving them, but with wear and tear.
The heavy group, the rumba group and the hip-hop group are included, which turns their parts into a jumble of voices. The soloists discover that they have to sing the entire second act dodging people, trying not to fall or run over any singers. We look at unexpected difficulties, one of the soloists is injured and her participation in the opera is in jeopardy.
The choirs rehearse for the first time accompanied by the orchestra and discover the power of their voices when they are accompanied by an orchestral mass made up of more than 70 musicians. But it is an orchestra formed by students of the Conservatory of the Liceu and they play with too much power, which causes the protest of some soloists.
Part four is the most epic of the series so far. The last fifteen minutes are focused on the grand opening of the opera: the arrival of the singers, on the red carpet, the knot in the throat before going on stage.
We will experience all these emotions by following the protagonists: Mouna, Joana, Arnau… How will it end? Will the two-year effort be worth it?