"Melissa" is the original opening. "Kesenai Tsumi" is the original close. "Ready Steady Go" is the second opening, and "UNDO" the third. "Motherland" is the third closing.
They do not have the second closing, which is just as well. It really, truly needs artwork to go with it. In context, it's really lovely. There's this beautiful shot of the main character's human and mechanical hands, next to each other...
There's a song, "Brothers", which is just a theme... I think it's the Ed/Al image song, but I'm not really sure. It's quite haunting and I listened to it several times. It's interesting to hear the times when that plays inside the anime... usually illustrating something about the brothers' relationship...
Thanks; I'm downloading "Melissa" now.