I've always loved the movie Copycat, about the serial killer who imitates previous serial killers. That got me thinking about infamous crimes that may or may not have been ispired by music, movies, televsion or previous crimes. Here are some that come to mind..

Joseph Brant: Killed his wife sharon by setting her aflame an hour after watching the farrah fawcet made for television movie The Burning Bed. In the movie farrah plays a wife who douses her husband in gasoline and set him aflame while he sleeps. The film itself is based on a true storry
http://www.time.com/time/magazine/article/0,9171,951337,00.html

The North Hollywood shoot out: Larry Eugene Phillips, Jr. and Emil Matasareanu were two heavily armed bank robbers who went to war with the LAPD. It's rumored that the Bank Heist in Michael Mann's Heat Inspired them

Benjamin James Darrus and his 18-year-old girlfriend Sarah Edmondson: Go on a short lived killing spree inspired By the movie Natural Born Killers
http://www.trutv.com/library/crime/notorious_murders/celebrity/natural_born_killers/1.html