Of course, as has been the case for many an anime crossing over from Japan to North America, changes had to be made. In the case of "Gatchaman", that included a different instrumental theme song. However, instrumental versions of the original Japanese beginning and ending themes were used throughout "Battle of the Planets".
Anime song and children's song vocalist Masato Shimon（子門真人）, who would later become the singer behind one of the Oricon rankings juggernauts of 1975, "Oyoge! Taiyaki-kun"(およげ！たいやきくん....Swim Taiyaki!), sang the opening theme, "The Gatchaman Song", with a children's chorus group, The Columbia Yurikago Kai （コロンビアゆりかご会）as backup. His machine gun-like staccato delivery of the opening words "Dare da, dare da, dare da!"(Who is it? Who is it? Who is it?) is still recognizable even today, and the song carries that usual brass-and-strings infused urgency that accompanied Japanese superhero theme songs of that time.
Even with all of the changes, I really enjoyed "Battle of the Planets", although I do cringe at some of the 7-Zark-7 insertions.