Sources and theme

History of Les Paul guitars
the sources are :
http://en.wikipedia.org/wiki/Gibson_Les_Paul
http://www.lespaulguide.com/
http://www.allaboutguitars.info/
http://www.gibson.com/en-us/Support/AboutUs/
http://www.ultimate-guitar.com/columns/the_history_of/the_history_of_les_paul.html