I thought the concert was great! I was quite impressed that Mr. Carreras sang with only a piano. At the start of the concert, the staff had failed to attach the music stand to the piano. Mr. Carrera said to the audience, "Part of the piano is missing." He was barely audible. I thought, "Great! If I can barely hear him say that, I won't be able to hear his singing." There were no visible microphones on stage. However, much to my surprize and enjoyment, his singing was loud and clear.
Unfortunately, the person sitting next to me could only utter complaints such as there was no orchestra; why was he singing by himself; he should have chosen other music, etc.
As far as I was concerned, Carreras singing without an orchestra gave the audience 2 hours of his music. With an orchestra, the orchestra would have played for one hour with Carreras singing one hour!