Flashmob group CITYROCKS has done it again - assembling 150 musicians in Romania to perform the Green Day hit - Boulevard of Broken Dreams.  Check out the video - 

The group had previously covered Nirvana‘s ‘Come As You Are’ and Metallica‘s ‘Enter Sandman’.

Impressive as it is - it hardly holds a candle to the 1000 musicans who gathered to perform Foo Fighters!