I used to watch this show when I was a little girl, and I thought that all the songs they sang were written for the show. Therefore I regarded it as some musical miracle. Only later I found out that those cute teen girls were singing 60s songs - but by then I also found out that this show has made my knowledge for 60s and 70s songs as deep as my parents'!
Anyway, this TV show is very well done, well acted and I couldn't help but find myself totally hooked with it. Watch it if you happen to find it on reruns - you'll enjoy it!