I used this activity to end a unit on various classical songs, We listen to new classical music each week in class. I always show commercials that use classical songs. Students choose a product to sell. Then they create dialogue about the product. I gave a time requirement of 20-30 seconds. Then they choose a classical song and where to use it in their commercial.
Some popular songs are Bizet's Carmen (Toreador or Overture), Rossini's William Tell, Offenbach's Can Can, Rimsky-Korsakov's Flight of the Bumblebee. The choices are endless.
I did audio (MP3) recordings and posted them to my website. I can email you a couple finished products. =)