Image by Thakingdome of Wikipedia Media reported June 23, 2015 that Nickelback is canceling its 2015 tour due to lead singer's Chad Kroeger suffering from a vocal cord cyst . He will be undergoing surgery to excise this cyst sometime in July 2015 and will need to be on voice rest . He joins a number of other singers over the past few years who had to cancel their tours due to such vocal cord problems including: • Sam Smith - April 2015 • Nathan Sykes - April 2013 • Nicki M…