"Echo Chamber (song)"@en . "This is a song featured in the Presidio demos recorded sometime between 2002 and 2003. It features many 'tropical' sounds in the background and actually has very little instruments playing in it, aside from a few drums and a melodic guitar riff. The song itself is very short and is notably different from the material Metallica is known for."@en . "This is a song featured in the Presidio demos recorded sometime between 2002 and 2003. It features many 'tropical' sounds in the background and actually has very little instruments playing in it, aside from a few drums and a melodic guitar riff. The song itself is very short and is notably different from the material Metallica is known for."@en . .