story: Pat had a song stuck in her head all day. She tried to ignore it but it wouldn't go away. When her mind when blank she heard the song. She tried to listen to the radio until the song was flushed out. After a few country songs she forgot all about the first one.
 selected sentence: When her mind when blank she heard the song.
A song stuck in pat's head >Causes/Enables> Pat heard the song when her mind was blank