He came here on march 2004 with his Solo Tour, and it was very interesting to see him perform all alone. He played the harp, guitar and piano and sang along various songs of his and Yes', most of them very shortened. He sang 50/50 his songs and Yes' songs, he also played one a capella song that he composed the same day for the remembering of the tragic train terrorist bombing in Madrid that had happened the day before. After all, it wasn't an all exciting concert as tou may predict, but indeed very interesting. I recommend you to go.
The Yes' songs I remember he sang were: Long Distance Runaround, I've Seen al good People, And you and I, Soon, The Reavealing Science of God, Yours is No Disgrace and i'm not sure if it was Wonderous Stories or Turn of the Century. He ended it with a dance electronic mix of, yep, you guessed it, Owner of a Lonely Heart, all playback of course. You should go if you have the opportunity.
Erik