According to CDDB.com Metalica is one of the most played metal bands worldwide! How do they know that, and what is CDDB?
Example: when you insert a music CD in your computer, the software player application (EG: Winamp) on your computer uses the CDDB online service to first identify the CD, and then display the artist, title, tracklist, and other information to you instantly.
The Gracenote Digital Top 10 represents the most-played albums on the Internet, aggregated weekly from over 24 million listeners worldwide using the Gracenote CDDB Music Recognition Service. Here is the complete metal list, including as many as 3 Metallica albums.
1 Staind : Break The Cycle
2 Tool : Lateralus
3 Metallica : S & M
4 Metallica : Metallica (Black Album)
5 Incubus : Make Yourself
6 Papa Roach : Infest
7 Disturbed : The Sickness
8 Metallica : Garage Inc.
9 Korn : Follow The Leader
10 Guns N' Roses : Appetite For Destruction
According to the same source, Metallica was also the most played band last year.
Encyclopedia Metallica
http://www.encycmet.com