One for the conspiracy brigade
http://www.dailymail.co.uk/news/article-3456741/Apollo-10-astronauts-heard-mysterious-music-far-moon-newly-uncovered-tapes-reveal-no-wasn-t-Pink-Floyd.html
It was mentioned very briefly at the time that they had received radio signal behind the moon and then less then a day later the media stopped mentioning it.
http://www.dailymail.co.uk/news/article-3456741/Apollo-10-astronauts-heard-mysterious-music-far-moon-newly-uncovered-tapes-reveal-no-wasn-t-Pink-Floyd.html
It was mentioned very briefly at the time that they had received radio signal behind the moon and then less then a day later the media stopped mentioning it.