Board Thread:General Discussion/@comment-3522837-20150511051335/@comment-111.184.6.142-20150822155112

Fighter and Dogfight have a similar melody (not the guitar part, but the rock violins. I don't know how to describe it, so feel welcome to correct me.).

Rush and Keep Alive share chorus parts.

Diapason, Zero, Galm 2 have similar base tunes, along with many other ACZ OSTs.

It seems like Ace Combat themes (5,0,6, AH and AHL especially) seem to have theme melodies that a portion of the OSTs always include.

And of course, Stonehenge and Stonehenge's Attack.