The Grass Roots are one of those bands that have a lot of songs that get favorable play on "oldies" stations, but aren't really celebrated. They certainly don't get the respect given a lot of their SF contemporaries. Too poppy I guess. There was a time when a band could have a hit without anyone really knowing what they looked like. The Grass Roots had 14 top-40 hits but would probably not have been stopped on the street by anyone recognizing them. Even in the pre-music video world, this facelessness could work against you.
The bass-into-horn intro of "Midnight Confessions" is powerhouse stuff. I don't know that they ever equalled that, in my book. "Sooner or Later," "Two Divided By Love," "I'd Wait A Million Years," "Temptation Eyes"... all staples of oldies formats.
Here's to the Grass Roots, especially the Grass Root who is reading the Kritzer books.