"You can only start a boyband if you kill one of the ones already out there"

This quote by Joel Madden is a humorous method of saying that the music market is highly competitive which it is challenging to get into the industry. He is recommending that in order to start a boyband, one need to be willing to go to extreme lengths to stand out from the competitors. This might imply that a person must want to put in a great deal of hard work and devotion to make their band successful. It could also suggest that one need to want to take threats and be imaginative in order to stand out from the other bands. Ultimately, Joel Madden is suggesting that it takes a lot of effort and commitment to make it in the music market.