Probably because they so often come to Turkey for concerts. They have a huge fan base in Turkey. There will be less visa hassles. A more Turkic explanation is that they fell in love with some Turkish girls:)

Israeli heavy metal band members apply for Turkish citizenship – The National

by Turkish Digest
Israeli heavy metal band members apply for Turkish citizenship

Thomas Seibert
Aug 27, 2012

ISTANBUL // Even in the midst of a deep political crisis between Turkey and Israel, there are songs to be sung – loudly and backed by the screech of distorted guitars.

12 Tracks For Prince Harry?s Debauched Weekend

Black Metal Bassist Is Now A Member of Greek Parliment; Might Be A Neo-Nazi

from Metal Injection
You see that dude on the left? His name is Giorgos Germenis. Not only is he the bassist of Greek black metal band, Naer Mataron, but he will represent the Golden Dawn party from the Greater Athens district in Greek parliament. Here’s the best part! The Golden Dawn party is known as one of the

LAMB OF GOD Seeks Global Fans for 2012 Documentary

from Metal Injection
It appears our beloved Richmond, VA-based metal titans ? Lamb of God ? are infiltrating the houses of the [un]holy and global, metal gospel; with the recognition that their fan-base has extended far into the obscurest reaches of the Asian subcontinent and Middle East, Lamb of God has chosen one of the most politically turbulent, ..

A History of Rock ?n? Roll in 100 Riffs

from Open Culture by Dan Colman