Great Difference

Here's a fun, understated passage from one of the Martin Beck novels, written in 1969. Beck and  Kollberg are police; Beck's 16-year-old daughter has just left them:

When Martin Beck and Kollberg came out into the hall to put on their overcoats, loud pop-music was pouring out through her closed door.

     "The Beatles," said Martin Beck. "It's a miracle her ears don't drop off."

     "The Rolling Stones," said Kollberg.

     "How can you tell the difference?"

     "Oh, there's a great difference," said Kollberg, starting down the stairs.      (Maj Sjowall and Per Wahloo, The Fire Engine That Disappeared, transl. Joan Tate, pp. 94-95)