George and Lynne have gone to a dance or a wedding and are frankly disgusted at the state of this modern music that is being played by the band. It is some sort of punk band. George and Lynne are still part of the previous generation and don't understand punk music. Lynne then makes a comment on how bad the Eurovision song contest is by saying that the band would make the Eurovision songs look good (0r something).
George and Lynne are diving headfirst into the punk generation and, quite frankly, they don't understand it. They are dancing to a song and then suddenly the band decide to destroy their equipment, in the way rock bands do. Now either George and Lynne have been dancing to the entire set and it's only at the last song do they decide to comment on the band, or the band are only playing one song. I'm not sure how a wedding band can afford to smash their equipment. I can also only assume that the Eurovision song contest has just been on recently, making Lynne's comment topical.
George likes the music of Frank Sinatra, and Lynne likes Demis Roussos.