Which two parts of this excerpt from F Scott Fitzgerald winter dreams helps build anticipation in the story

Dexter put on his bathing suit and swim out to the farthest raft where he stretched dipping on the white canvas of the springboard
There was a fish jumping and a star shining and the lights around the lake we’re going over on a dark peninsula of piano was playing the songs of last summer end of summer before the songs from Chin Chin and the count of Luxembourg and the chocolate soldier and because the sound of the piano overstretch the water had always seemed beautiful to Dexter he lay perfectly quiet and listen
The tune the piano is playing at the moment has been getting a new five years before when Dexter was a sophomore in college they had played it a problem once when he cannot afford the luxury of problems and he had stood outside the gymnasium and listen to the sound of the tune precipitated In him a sort of ecstasy and it was with the ecstasy reviewed what happened to him now it was a mood of intense appreciation a sense that for once he was magnificently attuned to life and that everything about him was radiating a brightness and a glamour he might never know again