Monksters!

I'd like to do an operation like tr/// on all elements of a list.

  my @beatles = ('John', 'Paul', 'George', 'Ringo');
  @beatles =~ tr/A-Z/a-z/;  # <--- doesn't work !!!
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I think I'm hung up because tr/// returns the number of matches.
I could use a foreach, but it seems not terribly perlish.

Thanks for your help!