In the late '60s, The Grass Roots went on The Jimmy Durante Show and played their hit song "Let's Live For Today." It wouldn't be the last time on TV for one of the band's members, however.
Take a look at the guitarist standing toward the back - his first close-up is about the 1:30 mark (but the one at 1:50 should seal it).
Can't figure it out? Here's a more recent picture.