For future reference, here are links mentioning the MSD:
Nature, July 2012
Billboard.biz, March 2012
Forbes, November 2011
CILIP magazine, November 2011
Le Site du Zero, June 2011 (French)
Columbia Spectator, March 2011
Geek Week, March 2011 (Polish)
Wired (Italia), March 2011 (Italian)
NeoTeo, March 2011 (Spanish)
Le Monde, March 2011 (French)
Ars Technica, March 2011
Golem, March 2011 (German)
The Chronicle of Higher Education, March 2011
Fast Company, March 2011
We All Make Music, March 2011
Billboard.biz, March 2011
Hypebot, March 2011
The Next Web, March 2011
The Echo Nest press release and official blog, March 2011
Billboard.biz, March 2012
Forbes, November 2011
CILIP magazine, November 2011
Le Site du Zero, June 2011 (French)
Columbia Spectator, March 2011
Geek Week, March 2011 (Polish)
Wired (Italia), March 2011 (Italian)
NeoTeo, March 2011 (Spanish)
Le Monde, March 2011 (French)
Ars Technica, March 2011
Golem, March 2011 (German)
The Chronicle of Higher Education, March 2011
Fast Company, March 2011
We All Make Music, March 2011
Billboard.biz, March 2011
Hypebot, March 2011
The Next Web, March 2011
The Echo Nest press release and official blog, March 2011