Wikipedia:
Boulevard Of Broken Songs (also known as Wonderwall Of Broken Songs or Wonderwall of Broken Dreams) is a popular mash-up mixed by San Francisco, California DJ and producer Party Ben in late 2004. 

The mash-up first appeared as the finale of Party Ben's Sixx Mixx radio show on LIVE 105  on Friday, October 1st, 2004. It was posted as a standalone mp3 on his website a few days later. The track began receiving radio airplay and was eventually aired on hundreds of radio stations worldwide [1], despite having no official release.

ИМХО. 
Оказывается, очень забавно можно смешать песни, построенные на малом количестве одинаковых аккордов...