<http://schema.org/description>
"On 8 Nov 1971, Led Zeppelin released their fourth album. With no title printed on the album, and generally referred to as Four Symbols, The Fourth Album ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.co.uk/neil-cossar/led-zeppelin-four-symbols_b_4237319.html?ir=Entertainment>