none really. sometimes it's just the sound of the guitars producing some melody or.. uh, noise that my brain is making up than an actual SY tune.
their music isn't immediately catchy. it's more wondering and open ended to get stuck in the head. which would make it more melodic than catchy. melodic yeah maybe in a weird way, catchy no.
it's like this, Beach boys melodic. Beatles catchy. there's a difference I think. right?