Sorry for not getting to you guys sooner: BUT the answer is:
Wait until the end of the day... if no one gets it by then.
I need to clarify a few issues about the questions:
First, for a single 
record to be a million seller, it must be a single recording of a single piece. In other words, one cannot just say, over a million copies of Beethoven's Fifth Symphony has been sold, because they are many, many recordings of that piece. I am specifically asking for one recording of one piece that was the first to sell a million.... Hint.... look here:
http://www.philclas.polygram.nl/class/pihome/basis.htm