First time I heard these guys was when the 3 of them sat in a small boat and sang a love song the concept of 3 guys boarding a boat like that and singing like that kind of was odd to me and almost all my other friends who saw the video, I can understand because of the circumstances in Iran things can be complicated, but still you can find much more appropriate ideas to execute music videos, but anyway this is totally off topic, therefore I won't get into details etc.
In regards to the Turkish influenced music of nowadays in Iran, it sort of bothers me as well, our Iranian scale music seems to have derived from its origin steering away further and further day after day, as Pourya jaan mentioned the direction used to be that of Greek and Arabic music, while over the years it has gradually and now heavily redirected to the Turkish music influence, ironically majority of the current popular domestic vocalists are comprised of those who have employed this Turkish music style and seems the public enjoys it to its max as well.
7th band in particular is one of those heavily influenced bands by Turkish music, or at least this tune "Dooset Daram" which BTW I happen to be one of its admirers myself as it carries a very catchy chorus and instrumental line (Bouzouki)
Next music genre being utilized by many other artists in Iran is the Western music influence including the European singing lines which also seems to have drawn in its own audience and fans (Sirvan being one of its pioneers)
The question which worries me is the way this trend is leading and proceeding, is it possible that soon our own music style be forsaken and forgotten by the next generation? I hope not!